Holotype : ♂, China: Yunnan, Lvchun, Yakou, Shuikuxiafang, (23°3'25.2"N, 102°46'37.71"E), 1780 m, collected by Malaise trap, 2019.IV.19-V.19, Liang Wang and Xin Li (CAU). Paratypes: 19 ♂♂, the same data as holotype (CAU).

Male eyes contiguous on face. Mesonotum wholly dark yellow; scutellum dark yellow; postnotum dark brown posteriorly. Laterotergite with two minute dark brown or black spots at anterior margin and one large dark brown spot posteriorly. Hind tarsomere 1 with cluster of short thick posterior bristles at extreme base, several short ventral bristles and four short apical bristles (MSSC). Ventral surstylus rather wide, widened apically.

Male (Fig. 1A). Body length 5.0–5.7 mm, wing length 4.1–4.2 mm.

Figure 1. 

Neurigona apicilata sp. nov. A male habitus, lateral view B genitalia, lateral view. Abbreviations: C – cercus; H – hypandrium; LP – lateral process; PH – phallus; SDL – surstylus dorsal lobe; SVL – surstylus ventral lobe. Scale bars: 1 mm (A); 0.1 mm (B).

Head metallic green with pale gray pollinosity; face very narrow, eyes contiguous on face. Hairs and bristles on head black, but postocular bristles (except uppermost two bristles) and postero-ventral hairs pale yellow. Antenna (Fig. 8A) yellow except first flagellomere brown; first flagellomere somewhat oval, approximately as long as wide, obtuse apically, with pale white pubescence; arista subapical, dark brown. Proboscis pale yellow with pale hairs; palpus pale yellow with pale yellow hairs and two to three short black apical bristles.

Thorax dark yellow with fine pale yellow pollinosity; mesonotum dark yellow; postalar callus with a small dark brown spot; postnotum dark brown posteriorly. Pteropleuron with a small black subtriangular spot. Laterotergite with two-minute dark brown or black spots at anterior margin and one large dark brown spot posteriorly. Hairs and bristles on thorax black, six strong dc, 18–20 irregularly paired acr short hair-like; scutellum with two pairs of bristles, lateral pair long and strong, median pair short and hair-like. Propleuron with one brown bristle on lower portion.

Legs mainly yellow, but fore tarsomeres 2–5 brown and mid and hind tarsomeres 2–5 dark brown. Hairs and bristles on legs black. Fore coxa with three or four thick bristles on antero-apical portion mostly or wholly dark yellow; mid coxa with three anterior and apical bristles; hind coxa with one strong outer bristle at basal 1/3. Mid and hind trochanters each with one outer bristle at middle. Fore tibia devoid of bristles; mid tibia with two ad, two pd and two apical bristles; hind tibia with three ad, four pd, three apical bristles and one row of brownish yellow comb-like bristles. Fore tarsomere 1 with two short thin apical bristles. Mid tarsomere 1 with five short or long apical bristles. Hind tarsomere 1 with cluster of short thick posterior bristles at extreme base, several short ventral bristles and four short apical bristles. Relative lengths of tibiae and five tarsomeres of legs –LI 5.3: 6.2: 3.2: 2.1: 1.9: 0.9; LII 5.9: 9.1: 2.9: 2.1: 1.2: 0.7; LIII 9.8: 4.8: 4.1: 2.2: 1.2: 0.8.

Wing nearly hyaline, tinged brown; veins brown, M₁₊₂ gently bent apically and convergent with R₄₊₅; CuAx ratio 0.34. Squama yellow with pale yellow hairs. Halter yellow.

Abdomen yellow with yellow pollen, terga 2–5 dark yellow; terga 2–5 each with large blackish spot somewhat narrowed posteriorly. Hairs and bristles on abdomen black except those on venter more or less yellow.

Male genitalia (Fig. 1B) mainly shiny black. Epandrium longer than wide, with two lateral processes (one short and thin, with two apical hairs; the other long and wide, subtriangular). Ventral surstylus rather wide, widened apically; dorsal surstylus rather wide, slightly narrower than ventral surstylus, with very narrow medial incision at tip. Cercus somewhat round, white, bearing short white hairs. Hypandrium long and somewhat thick. Phallus thin, hidden within hypandrium.

Female. Unknown.

China (Yunnan).

The specific name refers to the ventral surstylus widened apically.

The species is very similar to N. qingchengshana Yang & Saigusa, 2021 from Sichuan, but may be separated from the latter by the fore tarsomere 1 longer than fore tibia and ventral surstylus much widened at extreme tip. In N. qingchengshana, the fore tarsomere 1 is as long as the fore tibia, and the ventral surstylus is weakly widened at extreme tip (Yang and Saigusa 2001a; Yang et al. 2011).

Holotype : ♂, China: Yunnan, Lvchun, Yakou, Shuikuxiafang, (23°3'25.2"N, 102°46'37.71"E), 1780 m, collected by Malaise trap, 2019.IV.19-V.19, Liang Wang and Xin Li (CAU). Paratypes: 2 ♂♂, the same data as holotype (CAU).

Mesonotum with three brown longitudinal stripes at middle posterior region. Abdominal sternite 5 quadrate. Fore tibia basally weakly thickened and bent. Ventral surstylus wide, distinctly bent with distinctly bent and narrowed tip; dorsal surstylus short and broad, folded inward, apically furcated.

Male (Fig. 2A). Body length 3.8 mm, wing length 3.2 mm.

Figure 2. 

Neurigona basicurva sp. nov. A male habitus, lateral view B genitalia, lateral view. Scale bars: 1 mm (A); 0.1 mm (B).

Head metallic green with pale yellow pollinosity; eyes narrowly separated on middle portion of face. Hairs and bristles on head black, but postocular bristles and postero-ventral hairs pale yellow. Antennal scape and pedicel (Fig. 8B) yellow; first flagellomere dark yellow, almost as long as wide, round apically, with pale brown pubescence; arista subapical, brown, basal segment 0.1× longer than apical segment. Proboscis yellow with pale hairs; palpus pale yellow with two black apical bristles.

Thorax yellow with fine pale yellow pollinosity; mesonotum dark yellow with three brown longitudinal stripes at middle posterior region; scutellum brownish; postnotum brownish with dark yellow basal margin; laterotergite with a small black inner spot at anterior margin. Pteropleuron below wing base with a small black spot. Hairs and bristles on thorax black, six strong dc, 11–12 irregularly paired acr short hair-like; scutellum with two pairs of bristles, lateral pair long and strong, median pair short and hair-like.

Legs mainly yellow, but fore tarsus dark brown, mid and hind tarsi pale brown. Hairs and bristles on legs black. Fore coxa with six mostly yellow bristles on antero-apical portion; mid coxa with three anterior and apical bristles; hind coxa with one strong outer bristle at basal 1/3. Mid trochanter with two bristles, hind trochanter with one bristle. Fore femur with two rows of short dense av. Fore tibia modified, basally weakly thickened and bent, with two rows of long dense black anterior bristles at basal 1/3 and two rows of short dense brownish yellow anterior hairs at remaining 2/3. Mid tibia with one outer bristle and one pd, apically with one bristle. Hind tibia with one pd, apically with three bristles and one row of pale brown comb-like bristles apically. Fore tarsomere 1 modified, weakly bent, with short dense and erect pv; tarsomeres 2–4 with fine but dense ventral hairs. Mid tarsomere 1 with one pv at extreme base. Hind tarsomere 1 with cluster of short erect bristles basally. Relative lengths of tibiae and five tarsomeres of legs – LI 6.7: 5.9: 2.8: 1.8: 1.2: 1.0; LII 7.5: 8.8: 3.0: 2.0: 1.1: 0.8; LIII 12.1: 4.0: 4.0: 2.1: 1.3: 0.7.

Wing nearly hyaline, tinged brown; veins brown, M₁₊₂ gently bent apically and convergent with R₄₊₅; CuAx ratio 0.45. Squama yellow, but brown at margin, with yellow hairs. Halter dark pale yellow.

Abdomen yellow with pale yellow pollen; terga 1–4 each with large dark brown spot; sternum 5 projected, quadrate (Fig. 9A). Hairs and bristles on abdomen black except those on venter more or less yellow.

Male genitalia (Fig. 2B): epandrium longer than wide, with two lateral processes (one very long and narrow; the other thick, with finger-like outer process near base, apically somewhat bent, and with one yellow bristle at apical 1/4). Ventral surstylus wide, distinctly bent with distinctly bent and narrowed tip; dorsal surstylus short and broad, folded inward, apically furcated. Cercus relatively small, trapezoid, white, with short pale yellow hairs. Hypandrium long and somewhat thick. Phallus long and thin, subapically with a denticle.

Female. Unknown.

China (Yunnan).

The specific name refers to the fore tibia basally weakly thickened and bent.

The species is peculiar and can be easily separated from other known species of the genus by the quadrate 5^th abdominal sternite and fore tibia basally weakly thickened and bent.

Holotype : ♂, China: Yunnan, Lvchun, Yakou, Shuikuxiafang, (23°3'25.2"N, 102°46'37.71"E), 1780 m, collected by Malaise trap, 2019.IV.19-V.19, Liang Wang and Xin Li (CAU). Paratypes: 69 ♂♂, 19 ♀♀, the same data as holotype (CAU).

Eyes almost contiguous on middle portion of face. Mesonotum with a brown mid-posterior stripe. Postnotum with a nearly W-shaped dark brown spot. Mid tibia and tarsus with row of short dense crochet-like av hairs. Hind tibia with short blackish comb-like apical bristles on very short and plate-like process. Ventral surstylus rather large and broad, ~ 1.5× wider than dorsal surstylus, apically with four long hairs.

Male (Fig. 3A). Body length 5.4 mm, wing length 4.2 mm.

Figure 3. 

Neurigona brevidigitata sp. nov. A male habitus, lateral view B genitalia, lateral view. Scale bars: 1 mm (A); 0.1 mm (B).

Head metallic green with pale yellow pollinosity; eyes almost contiguous on middle portion of face. Hairs and bristles on head black but postocular bristles and postero-ventral hairs pale yellow. Antenna (Fig. 8C) yellow; first flagellomere somewhat oval, ~ 1.1× as long as wide, round apically, with brown pubescence; arista subapical, brownish. Proboscis yellow with pale hairs, with two long pale hairs, longer than proboscis; palpus pale yellow, but brownish at basal 1/3, with yellow hairs.

Thorax yellow with fine pale yellow pollinosity; mesonotum with one brown longitudinal stripe at middle posterior region; scutellum brown at margin, with minute brown middle spot at basal margin; postnotum with a nearly W-shaped dark brown spot. Pteropleuron below wing base with a small black spot. Laterotergite with one blackish stripe and one minute brown spot at anterior margin. Hairs and bristles on thorax black; six strong dc, 12 irregularly paired acr short and hair-like; scutellum with two pairs of bristles, lateral pair long and strong, median pair short and hair-like. Propleuron with one yellow bristle on lower portion.

Legs mainly yellow; fore tarsomeres 3–5 and mid and hind tarsomeres 2–5 dark brown. Hairs and bristles on legs black except hairs on fore coxa yellow. Fore coxa with four thick dark brownish yellow bristles on antero-apical portion; mid coxa with three or four partly brownish yellow or black anterior and apical bristles; hind coxa with one strong black outer bristle at basal 1/3. Mid and hind trochanters each with one outer bristle at middle. Fore tibia devoid of bristles. Mid tibia with two ad, two pd, row of short dense crochet-like av hairs, and two apical bristles. Hind tibia much elongated, 1.7× longer than fore tibia, with three ad, three pd, seven short thin pv, two thick apical bristles, and short blackish comb-like apical bristles on very short plate-like process. Fore tarsomeres 4 and 5 with slightly long hairs. Mid tarsus with row of short dense crochet-like av hairs; tarsomere 1 with two short ad, one long pd at extreme base, five av, and three apical bristles. Hind tarsomere 1 with pale-colored semi-fan-shaped ventral ridge bearing three short and three long hairs at extreme base, three av, and four apical bristles. Relative lengths of tibiae and five tarsomeres of legs – LI 6.8: 4.9: 3.2: 2.9: 2.1: 0.8; LII 8.2: 8.2: 3.5: 2.2:1.2: 0.7; LIII 11.5: 4.7: 4.1: 2.4: 1.3: 0.9.

Wing nearly hyaline, tinged brown; veins brown, M₁₊₂ gently bent apically and convergent with R₄₊₅; CuAx ratio 0.16. Squama yellow but brown at margin, with yellow hairs. Halter dark yellow, with cluster of hairs at base of knob.

Abdomen yellow with pale yellow pollen; terga 2–5 each with dark brown antero-laterally; hypopygium shiny dark brown. Hairs and bristles on abdomen black except those on venter more or less yellow.

Male genitalia (Fig. 3B): epandrium nearly as long as wide, with two lateral processes (one long, somewhat thick, apically with two short or long and thin processes, and one denticle at apical 1/6; the other very long and thin. Ventral surstylus rather large and broad, ~ 1.5× wider than dorsal surstylus, apically with four long hairs; dorsal surstylus short and broad, apically folded with an oblique finger-like process. Cercus basally somewhat round, white, bearing short white hairs, apically long finger-like. Hypandrium quite long and thin, apically acute. Phallus rather long and thin, apically acute, hidden within hypandrium.

Female. Body length 4–5.2 mm, wing length 3.8–4.2 mm. Similar to male, except the following features: eyes distinctly separated on face, narrowest distance in middle of face equal to distance between ocellar bristles; postnotum with a nearly U-shaped dark brown spot. Relative lengths of tibiae and five tarsomeres of legs – LI 4.2: 3.3: 2.1: 1.7: 0.9: 0.6; LII 5.2: 2.8: 2.0: 1.2: 0.7: 0.5; LIII 8.0: 3.1: 2.6: 1.5: 1.0: 0.6.

China (Yunnan).

The specific name refers to the dorsal surstylus with a short finger-like process apically.

The species is very similar to N. centralis Yang & Saigusa from Yunnan, but may be separated from the latter by the postnotum yellow with a nearly W-shaped dark brown spot and the mid tibia and tarsus with row of short dense crochet-like av hairs. In N. centralis, the postnotum is wholly blackish, and the mid tibia and tarsus do not have the crochet-like av hairs except the mid tarsomere 1 with row of erect av hairs (Yang and Saigusa 2001b; Yang et al. 2011).

Mesonotum with a black mid-posterior stripe. Postnotum wholly blackish. Mid tibia and tarsus without row of short dense crochet-like av hairs, but mid tarsomere 1 with row of erect av hairs. Epandrium short and wide. Dorsal surstylus short and wide with bifurcated apical process; ventral surstylus long, rather narrow.

China (Yunnan).

Holotype : ♂, China: Yunnan, Lvchun, Yakou, Shuikuxiafang, (23°3'25.2"N, 102°46'37.71"E), 1780 m, collected by Malaise trap, 2019.IV.19-V.19, Liang Wang and Xin Li (CAU). Paratypes: 3 ♂♂, the same data as holotype (CAU).

First flagellomere somewhat triangular. Wing subapically convex at anterior margin. Fore tarsomere 4 ventrally weakly swollen at extreme base and then weakly concave for a short distance. Ventral surstylus distinctly widened subapically, apically nearly finger-like; dorsal surstylus nearly as long as ventral surstylus, rather wide, apically somewhat narrow.

Male (Fig. 4A). Body length 5.1–5.9 mm, wing length 5.0–5.7 mm.

Head metallic green with pale gray pollinosity; eyes very narrowly separated on middle portion of face. Hairs and bristles on head black, but postocular bristles and postero-ventral hairs pale yellow. Antenna (Fig. 8D) pale yellow, pedicel yellow; first flagellomere dark brown, nearly triangular, almost as long as wide; arista subapical, dark brown, with short brown pubescence. Proboscis yellow with pale hairs; palpus yellow, but brown basally, with blackish setulae and two blackish setae.

Thorax yellow with fine pale yellow pollinosity; mesonotum dark brownish yellow, but brown on flat mid-posterior portion; scutellum dark brownish yellow; postnotum dark brown at basal margin; laterotergite with a small black stripe at anterior margin. Pteropleuron with a very small black subtriangular spot just below wing base. Hairs and bristles on thorax black, six strong dc, 10–11 irregularly paired acr, short, hair-like; scutellum with two pairs of bristles, lateral pair long and strong, median pair short and hair-like. Propleuron with one brown bristle on lower portion.

Legs mainly yellow, but mid and hind tibiae and tarsi brown to dark brown. Hairs and bristles on legs mostly black except hairs on fore coxa pale yellow. Fore coxa with five brownish bristles on antero-apical portion; mid coxa with three brownish anterior and apical bristles; hind coxa with one strong black outer bristle at basal 1/3. Fore tibia with one short ad. Mid tibia with three ad, two pd, and two black strong apical bristles. Hind tibia with three ad, three pd, three short apical bristles, and one row of brownish yellow comb-like bristles. Fore tarsus with very short hairs. Fore tarsomere 4 ventrally weakly swollen at extreme base and weakly incised outward, and with short and nearly erect ventral hairs; tarsomere 5 ventrally with short and nearly erect ventral hairs. Mid tarsomere 1 with two short ad, three short av, and four short thick apical bristles; tarsomeres 2–4 with several short spine-like ventral bristles. Hind tarsomere 1 with thick ventral bristles and three short thick apical bristles. Relative lengths of tibiae and five tarsomeres of legs LI – 7.1: 5.9: 2.2: 1.4:1.1: 0.9; LII 8.1: 8.2: 2.2: 1.3: 0.9: 0.8; LIII 11.2: 3.8: 3.6: 1.5: 1.2: 0.7.

Wing (Fig. 4B) subapically convex forward at anterior margin; nearly hyaline, tinged brown; veins brown; R₂₊₃ and R₄₊₅ convex forward at apical 1/3 and somewhat parallel; M₁₊₂ gently bent apically and convergent with R₄₊₅; CuAx ratio 0.75. Squama brown with pale yellow hairs. Halter dark yellow with brown knob.

Figure 4. 

Neurigona convexa sp. nov. A male habitus, lateral view B wing C genitalia, lateral view. Scale bars: 1 mm (A); 0.05 mm (B); 0.1 mm (C).

Abdomen yellow with pale yellow pollen; terga 2–5 each with large dark brown spot at middle; hypopygium shiny dark brown. Abdominal sternite 5 distinctly projected, large subtriangular (Fig. 9B). Hairs and bristles on abdomen blackish except those on venter more or less yellow.

Male genitalia (Fig. 4C): epandrium wider than long, with two lateral processes (one long finger-like; the other long and somewhat thick, apically slightly dilated with very short and acute apico-dorsal process). Ventral surstylus distinctly widened subapically, apically nearly finger-like; dorsal surstylus nearly as long as ventral surstylus, rather wide, apically somewhat narrow. Cercus somewhat round, white, bearing short pale yellow hairs. Hypandrium short and acute. Phallus somewhat short and thin, hidden with hypandrium.

Female. Unknown.

China (Yunnan).

The specific name refers to the wing subapically convex at anterior margin.

The new species is peculiar and can be easily separated from other known species of the genus by the wing subapically convex at anterior margin and arista shorter than head width.

Holotype : ♂, China: Yunnan, Lvchun, Yakou, Shuikuxiafang, (23°3'25.2"N, 102°46'37.71"E), 1780 m, collected by Malaise trap, 2019.IV.19-V.19, Liang Wang and Xin Li (CAU).

Mesonotum with brown subtriangular spot at middle posterior region; scutellum dark brownish yellow with dark yellow posterior margin; postnotum dark brown with dark yellow anterior margin. First flagellomere somewhat oval. Hind tarsomere 1 with cluster of short, erect, and fine ventral bristles basally, three pv on apical 1/3, and two apical bristles. Ventral surstylus apically strongly bent, with bifurcated tip; dorsal surstylus wider than ventral surstylus, nearly quadrate, apically with one knife-like dorsal process.

Male (Fig. 5A). Body length 3.0 mm, wing length 3.5 mm.

Head metallic green with gray pollinosity; eyes very narrowly separated on middle portion of face. Hairs and bristles on head black, but postocular bristles and postero-ventral hairs pale yellow. Antenna (Fig. 8E) yellow except first flagellomere dark yellow; first flagellomere somewhat oval, almost as long as wide, somewhat round apically, with dense brownish pubescence; arista subapical, dark brown with dark brownish yellow base. Proboscis yellow with pale bristles and hairs; palpus yellow with two strong black apical bristles.

Thorax yellow with fine pale yellow pollinosity; mesonotum with brown subtriangular spot at middle posterior region; scutellum dark brownish yellow with dark yellow posterior margin; postnotum dark brown with dark yellow anterior margin; laterotergite with blackish stripe at anterior margin and dark brown inner portion. Pteropleuron below wing base with a small black spot. Hairs and bristles on thorax black, six or seven strong dc, 10–12 irregularly paired acr short hair-like; scutellum with two pairs of bristles, lateral pair long and strong, median pair short and hair-like. Propleuron with one yellow bristle on lower portion.

Legs yellow except fore tarsus dark yellow with tarsomere 5 brown and mid and hind tarsi brownish yellow. Hairs and bristles on legs mostly black except hairs on fore coxa brownish yellow to brown. Fore coxa with four long thick brownish yellow bristles on antero-apical portion; mid coxa with three brownish yellow anterior and apical bristles; hind coxa with one strong black outer bristle at basal 1/3. Mid tibia with one ad, one pd, and two short or long apical bristles. Hind tibia with three ad, two pd, two apical ventral bristles, and one row of brownish yellow comb-like bristles. Mid tarsomere 1 with one short and one long dorsal bristles at base. Hind tarsomere 1 with cluster of short erect and fine ventral bristles basally, three pv on apical 1/3, and two apical bristles. Relative lengths of tibiae and five tarsomeres of legs – LI 11.3: 8.0: 5.0: 3.3:1.9: 1.0; LII 13.4: 14.1: 3.7: 2.9:1.6: 2.4; LIII 20.6: 5.9: 6.3: 3.8: 2.7: 1.2.

Wing nearly hyaline, tinged brown; veins brown, M₁₊₂ distinctly bent, somewhat geniculate, greater than 90 degrees; CuAx ratio 0.49. Squama yellow with yellow hairs. Halter yellow, but base of knob brown with cluster of black hairs.

Abdomen yellow with pale yellow pollen; terga 2–4 each with dark brown basal spot; abdominal sternum 5 distinctly projected, long and subtriangular (Fig. 9C). Hairs and bristles on abdomen black except those on venter more or less yellow.

Male genitalia (Fig. 5B): epandrium almost as long as wide, with two lateral processes (one extremely long and thin; the other long, somewhat wide, apically furcated). Ventral surstylus apically strongly bent, with bifurcated tip; dorsal surstylus wider than ventral surstylus, nearly quadrate, apically with one knife-like dorsal process. Cercus round with long dense yellow hairs, with long finger-like apical process. Hypandrium long and narrow. Phallus long and thin.

Figure 5. 

Neurigona huanglianshana sp. nov. A male habitus, lateral view B genitalia, lateral view. Scale bars: 1 mm (A); 0.1 mm (B).

Female. Unknown.

China (Yunnan).

The species is named after the type locality Huanglianshan.

This species is somewhat similar to N. henana Wang, Yang & Grootaert, 2007 from Henan of China, but may be separated from the latter by the arista subapical and mesonotum with one brown subtriangular spot at middle posterior region. In N. henana, the arista is dorsal, and the mesonotum is wholly yellow (Wang et al. 2007; Yang et al. 2011).

Holotype : ♂, China: Yunnan, Lvchun, Yakou, Shuikuxiafang, (23°3'25.2"N, 102°46'37.71"E), 1780 m, collected by Malaise trap, 2019.IV.19-V.19, Liang Wang and Xin Li (CAU). Paratypes: 21 ♂♂, the same data as holotype (CAU).

Eyes contiguous on face. Postnotum and laterotergite dark brown. Thoracic pleuron with four dark spots. Mid tarsus with row of crochet-like av hairs. Ventral surstylus longer than dorsal surstylus, rather narrow, but wide at apex; dorsal surstylus very wide, ~ 3× wider than ventral surstylus, with a long acute apico-dorsal process.

Male (Fig. 6A). Body length 5.2–6.1 mm, wing length 4.6–4.9 mm.

Head metallic green with pale gray pollinosity; face very narrow, eyes contiguous on face. Hairs and bristles on head black, but postocular bristles (except uppermost two) and postero-ventral hairs yellow. Antenna (Fig. 8F) yellow except first flagellomere brownish; first flagellomere basally wide, apically narrowed and obtuse, approximately as long as wide, with brown pubescence; arista subapical, dark brown. Proboscis pale yellow with dark yellow hairs; palpus pale yellow with blackish hairs and two short black apical bristles.

Thorax dark yellow with fine pale yellow pollinosity; mesonotum wholly dark yellow, postalar callus with a small dark brown spot; scutellum yellow; postnotum and laterotergite dark brown; mesopleuron, sternopleuron (except posterior portion), and hypopleuron (except postero-dorsal corner) dark brown, pteropleuron brown with a small black spot. Hairs and bristles on thorax black, six strong dc gradually becoming longer backward, 11–12 irregularly paired acr short and hair-like; scutellum with two pairs of sc, lateral pair long and strong, median pair very short and weak. Propleuron with one brown bristle on lower portion.

Legs mainly yellow, but brown or dark brown from tip of tarsomere 1 onward. Hairs and bristles on legs black except hairs on fore coxa yellow. Fore coxa with four thick yellow bristles on antero-apical portion; mid coxa with three mostly dark yellow anterior and apical bristles; hind coxa with one strong black outer bristle at basal 1/3. Mid and hind trochanters each with one spine-like outer bristle at middle. Fore tibia devoid of bristles. Mid tibia with three ad, two pd, and two strong apical bristles. Hind tibia with three ad, three pd, three strong apical bristles, and one row of yellow comb-like bristles. Mid tarsus with row of crochet-like av hairs; tarsomere 1 with one short ad at middle and one long pd at extreme tip. Relative lengths of tibiae and five tarsomeres of legs – LI 5.5: 5.9: 3.2: 2.3: 1.2: 0.8; LII 7.6: 7.9: 3.3: 1.8: 1.1: 0.8; LIII 11.2: 4.2: 4.0: 1.9: 1.2: 0.8.

Wing nearly hyaline, tinged brown; veins brown, M₁₊₂ gently bent apically and convergent with R₄₊₅; CuAx ratio 0.29. Squama yellow with pale yellow hairs. Halter pale yellow.

Abdomen yellow with yellow pollen; terga 2–5 each with large blackish basal spot. Hairs and bristles on abdomen chiefly black except those on venter more or less yellow.

Male genitalia (Fig. 6B) mainly shiny black. Epandrium longer than wide, with short acute apico-dorsal corner, with three lateral processes, ventral one long and finger-like, middle one long and wide, apically with a nearly U-shaped incision; dorsal one long and wide, curly at tip. Ventral surstylus longer than dorsal surstylus, rather narrow, but wide at apex; dorsal surstylus very wide, ~ 3.0× wider than ventral surstylus, with a long acute apico-dorsal process. Postgonite long and thick, covered with fine hairs. Cercus somewhat round, white, bearing short white hairs. Hypandrium long and wide. Phallus thin, hidden within hypandrium.

Figure 6. 

Neurigona quadrimaculata sp. nov. A male habitus, lateral view B genitalia, lateral view. Scale bars: 1 mm (A); 0.1 mm (B).

Female. Unknown.

China (Yunnan).

The specific name refers to the thoracic pleuron with four dark spots.

The species is similar to N. qingchengshana Yang & Saigusa, 2021 from Sichuan, but may be separated from the latter by the fore tarsomere 1 longer than fore tibia, 1.1× as long as fore tibia; and narrow ventral surstylus. In N. qingchengshana, the fore tarsomere 1 is as long as the fore tibia, and the ventral surstylus is rather wide (Yang and Saigusa 2001a; Yang et al. 2011).

Postnotum dark brown. First flagellomere brownish with yellow base. Fore tarsomeres 3 and 4 shortened, each 0.4× and 0.2× as long as tarsomere 2. respectively; tarsomeres 2 and 3 with long dorsal bristles, tarsomeres 3–5 with two rows of spine-like ventral bristles. Wing wholly hyaline. Dorsal surstylus short and wide with bifurcated apical processes; ventral surstylus long, rather narrow.

China (Yunnan, Shaanxi).

Holotype : ♂, China: Yunnan, Lvchun, Yakou, Shuikuxiafang, (23°3'25.2"N, 102°46'37.71"E), 1780 m, collected by Malaise trap, 2019.IV.19-V.19, Liang Wang and Xin Li (CAU). Paratypes: 3 ♂♂, the same data as holotype (CAU).

Frons and face yellow. First flagellomere somewhat quadrate. Mesonotum brownish to brown, but notopleuron somewhat pale; scutellum brown with dark yellow apical margin; postnotum brown with blackish middle line. Fore tarsomere 3 shortened and tarsomere 4 ventrally weakly concave with mammillary ventral process at extreme base. Ventral surstylus distinctly longer than dorsal surstylus, distinctly widened at middle, apically narrowed with short finger-like ventral process; dorsal surstylus short, much widened, ~ 1.5× wider than ventral surstylus.

Male (Fig. 7A). Body length 6.9 mm, wing length 5.2 mm.

Figure 7. 

Neurigona ventriprocessa sp. nov. A male habitus, lateral view B genitalia, lateral view. Scale bars: 1 mm (A); 0.1 mm (B).

Head metallic green with gray pollinosity, but yellow ventrally; eyes very narrowly separated on middle portion of face. Hairs and bristles on head black, but postocular bristles and postero-ventral hairs pale yellow. Antenna (Fig. 8G) pale yellow except first flagellomere brown; first flagellomere somewhat quadrate, 1.1× longer than wide, with slightly long, dense brownish pubescence; arista dorsal, dark brown. Proboscis mostly dark yellow, partly brown, with dark yellow and brown hairs; palpus dark yellow, but brown at base, with dark yellow hairs and two short brown bristles.

Figure 8. 

Antennae A Neurigona apicilata sp. nov. B Neurigona basicurva sp. nov. C Neurigona brevidigitata sp. nov. D Neurigona convexa sp. nov. E Neurigona huanglianshana sp. nov. F Neurigona quadrimaculata sp. nov. G Neurigona ventriprocessa sp. nov. Scale bars: 0.1 mm.

Thorax mostly dark yellow to brownish yellow with fine pale yellow pollinosity; mesonotum brownish to brown, but notopleuron somewhat pale; scutellum brown with dark yellow apical margin; postnotum brown with blackish middle line. Laterotergite with blackish stripe at anterior margin. Pteropleuron with a small black subtriangular spot. Hairs and bristles on thorax black, five strong dc, 14–15 irregularly acr short hair-like; scutellum with two pairs of bristles, lateral pair long and strong, median pair short and hair-like. Propleuron with one brown bristle on lower portion.

Legs mainly yellow, but hind femur ventrally dark brown at basal 1/3; mid and hind tarsomeres 2–5 brown or dark brown. Hairs and bristles on legs mostly black except hairs on all coxae dark yellow. Fore coxa with dark yellow hairs and six mostly brownish yellow bristles on antero-apical portion; mid coxa with two short black bristles and eight dense dark yellow anterior and apical bristles; hind coxa with dark yellow hairs and one strong outer black bristle at basal 1/3. Mid and hind trochanters each with one outer bristle at middle. All femora distinctly thickened basally. Fore tibia with one short ad and two short pd. Mid tibia with two ad, three pd, one av, two pv, and three apical bristles. Hind tibia with three ad, three pd, two short or long apical bristles, and one row of yellow comb-like bristles. Fore tarsomere 3 shortened with short dense ventral hairs; tarsomere 4 somewhat whitened, ventrally weakly concave, somewhat bare at middle, extreme base distinctly dilated with mammillary ventral process, extreme tip weakly dilated with several short curly brown ventral hairs; tarsomere 5 with quite dense, curly and dark brown ventral hairs. Mid tarsomere 1 with several short or long bristles. Relative lengths of tibiae and five tarsomeres of legs LI – 6.8: 6.7: 2.9: 0.8:1.1: 1.0; LII 8.8: 9.1: 3.7: 2.4:1.3: 0.8; LIII 13.9: 4.9: 4.8: 2.6: 1.8: 0.9.

Wing nearly hyaline, tinged brown; veins dark brown, M₁₊₂ strongly bent, geniculate nearly in a right angle; CuAx ratio 0.54. Squama dark yellow with brown margin bearing yellow hairs. Halter dark yellow with dark brown knob.

Abdomen yellow with pale yellow pollen; terga 1–4 each with large dark brown sport, tergum 5 wholly brown; sternum 5 weakly projected, small and subtriangular (Fig. 9D). Hairs and bristles on abdomen black except those on venter more or less yellow.

Figure 9. 

Abdominal sternite 5 (male) A Neurigona basicurva sp. nov. B Neurigona convexa sp. nov. C Neurigona huanglianshana sp. nov. D Neurigona ventriprocessa sp. nov.

Male genitalia (Fig. 7B): epandrium nearly as long as wide, with two lateral processes (one short finger-like; the other slightly long and thick, finger-like). Ventral surstylus distinctly longer than dorsal surstylus, distinctly widened at middle, apically narrowed with short finger-like ventral process; dorsal surstylus short, much widened, ~ 1.5× wider than ventral surstylus. Cercus long, with long dense yellow hairs. Hypandrium basally rather thick, apically narrowed. Phallus long and thin.

Female. Unknown.

China (Yunnan).

The specific name refers to the fore tarsomere 4 with mammillary ventral process at extreme base.

The species is somewhat similar to N. guangxiensis Yang, 1999 and N. zhejiangensis Yang, 1999 from Oriental China in having the nearly quadrate first flagellomere, but may be separated from them by the mesonotum brownish to brown, fore tarsomere 3 shortened and tarsomere 4 ventrally weakly concave with mammillary ventral process at extreme base. In N. guangxiensis and N. zhejiangensis, the mesonotum is yellow with markings on the middle posterior portion, and the fore tarsus is not modified (Yang et al. 2011).

Antenna brownish. Four strong dc; quadriseriate acr. Fore coxa with 4–6 black bristles on antero-apical portion. Apex of fore tarsomere 4 and entire fore tarsomere 5 white with white hairs. Hypopygium yellow. Dorsal surstylus wide with nearly acute tip; ventral surstylus slightly longer than dorsal surstylus, apically distinctly widened.

China (Yunnan).