Diglyphomorphomyia can be recognized by the following combination of characteristics: funicle 4 or 5 segmented; midlobe of mesoscutum or scutellum with deep punctures or pits; midlobe of mesoscutum with two or three, rarely four, pairs of setae; scutellum with sublateral grooves very distinct, punctate on bottom; propodeum with anterior margin raised into a perpendicular lamina, median carina and plicae distinct; transverse carina lateral to plicae distinct behind propodeal spiracle; gaster subsessile or short-petiolate.

Head in frontal view a little wider than its height; Antenna with six flagellomeres, including a 2-segmented clava; antenna inserted above level of lower eye margin, scape not reaching level of anterior ocellus. Eyes with short setae. Malar sulcus present. Pronotum without transverse carina, weakly reticulate, posterior margin with numerous setae and six long setae. Scutellum punctate. Dorsellum with engraved reticulation, meshes isodiametric. Propodeum smooth, with median carina and plicae, a transverse carina running from posterior part of each plica to outer margins of propodeum. Gaster subsessile.

Holotype , ♀ [NEFU; on card], China, Sichuan Province, Guangyuan City, Qingchuan County, 21 VIII 2015, leg. Ye Chen and Chao Zhang, by sweeping. Paratypes: 2♀ [on slides], China, Liaoning Province, Anshan City, Tiedong District, Gudaoguan, 19–21 VI 2015, leg. Yan Gao and Hui Geng, by yellow pan trapping.

Head dark brown. Antennae yellowish except F3, F4 brownish, club brownish except yellowish apex. Mesosoma yellow except propodeum brown. Midlobe of mesoscutum with two pairs of long setae. Scutellum with a longitudinal depression in anterior 2/3.

Female. Body length 2.4 mm, fore wing length 1.7 mm. Head dark brown. Antennae yellowish with F3 and F4 brownish, club brownish except yellowish apex. Mesoscutum, axillae and scutellum yellow. Propodeum brown. Legs yellowish. Gaster mostly yellow with two brown transverse bands posteriorly and margins brown. Ovipositor black.

Figures 1–4. 

D. depressa sp. nov., female, holotype 1 habitus in dorsal view 2 head in frontal view 3 fore wing 4 hind wing. Scale bars: 100 μm.

Head (Fig. 2) 1.2× as wide as high in frontal view and ~ 2.2× as wide as long in dorsal view. Lower face smooth, frons weakly reticulate. Vertex with engraved reticulation, meshes isodiametric, and scattered setae. POL 1.8× OOL. Malar space 0.4× eye height. Occiput weakly reticulate. Relative measurements (length: width): scape = 28: 5; pedicel = 10: 5; F1 = 16: 5; F2 = 11: 5; F3 = 12: 7; F4 = 10: 7; clava = 16: 7.

Mesosoma (Fig. 1). Midlobe of mesoscutum punctate with two pairs of long setae, lateral lobe of mesoscutum reticulate. Notauli ending laterad to inner angles of axilla. Axillae weakly reticulate and separated from each other. Scutellum with a longitudinal depression in anterior 2/3 and two pairs of long setae, sublateral grooves meet posteriorly. Spiracle with a transverse carina anteriorly, separated from metanotum by a distance shorter than a diameter of spiracle; each propodeal callus with seven long setae.

Wings. Fore wing (Fig. 3) 2.3× as long as wide. Speculum narrow. Relative measurements (length): SMV = 43; MV = 40; PMV = 22; STV = 16. Hind wing (Fig. 4) ~ 4.0× as long as wide.

Metasoma (Fig. 1). Gaster ovate, 1.8× as long as wide, and 1.1× as long as mesosoma. Ovipositor exserted beyond apex of gaster.

Male. Unknown.

Unknown.

China (Sichuan, Liaoning).

Latin: depressum = depression, sink; and refers to the longitudinal depression in anterior 2/3 of scutellum.

This new species differs from all other known members of the genus in having a scutellum with a longitudinal depression on its anterior 2/3.

Holotype , ♀ [NEFU; on card], China, Shandong Province, Qingdao City, Huangdao District, Dazhu Mountain, 22–24 V 2014, leg. Guo-Hao Zu, Xiang-Xiang Jing and Si-Zhu Liu, by yellow pan trapping. Paratypes: 1♀ [on slide], same data as holotype; 1♀ [on slide], CHINA, Shandong Province, Qingdao City, Huangdao District, Xiaozhu Mountain, 18–20 V 2014, leg. Guo-Hao Zu, Xiang-Xiang Jing and Si-Zhu Liu, by yellow pan trapping; 4♀ [on card], China, Shandong Province, Qingdao City, Laoshan District, Beijiushui, 1–3 VIII 2014, leg. Guo-Hao Zu and Ye Chen, by yellow pan trapping; 1♀ [on card], China, Shandong Province, Qingdao City, Laoshan District, Dahedong, 8–10 VII 2014, leg. Chao Zhang, Si-Zhu Liu and Ye Chen, by yellow pan trapping.

Figures 5–10. 

D. fossa sp. nov., female, holotype 5 habitus in dorsal view 6 antenna 7 fore wing 8 hind wing 9 habitus in lateral view 10 head in frontal view. Scale bars: 100 μm.

Antenna with scape, pedicel and F1 yellow and rest of flagellomeres dark brown. Scutellum with median groove in approximately anterior 1/2. Legs mostly yellowish with fore and hind coxae yellowish white. Gaster yellowish except margins brown.

Female. Body length 1.9 mm, fore wing length 1.3 mm. Body yellow. Mandibles yellow with teeth brown. Antenna with scape, pedicel, and F1 yellow and remainder of flagellomeres dark brown. Legs mostly yellowish except fore and hind coxae yellowish white. Gaster yellowish except margins brown. Ovipositor black.

Head (Fig. 10) 1.3× as wide as high in frontal view and ~ 2.3× as wide as long in dorsal view. Lower face and vertex transversely reticulate, frons weakly sculptured. POL 2.4× OOL. Malar space 0.4× eye height. Occiput weakly reticulate. Relative measurements (length: width): scape = 35: 6; pedicel = 11: 6; F1 = 19: 6; F2 = 12: 7; F3 =13: 8; F4 = 12: 8; clava = 20: 8.

Mesosoma (Fig. 5). Midlobe of mesoscutum punctate with three pairs of long setae, lateral lobe of mesoscutum reticulate. Notauli ending laterad to inner angles of axilla. Axillae weakly reticulate and separated from each other. Scutellum with median groove in approximately anterior 1/2 and two pairs of long setae, sublateral grooves meet posteriorly. Spiracle with a transverse carina anteriorly, separated from metanotum by a distance almost as long as a diameter of spiracle; each propodeal callus with six setae.

Wings. Fore wing (Figs 5, 7) 2.6× as long as wide. Relative measurements (length): SMV = 33; MV= 45; PMV= 17; STV= 12. Hind wing (Figs 5, 8) ~ 4.5× as long as wide.

Metasoma (Fig. 5). Gaster ovate, 1.7× as long as wide, and 1.2× as along as mesosoma. Ovipositor exserted beyond apex of gaster.

Male. Unknown.

Unknown.

China (Shandong).

Latin: fossa = ditch, trench; and refers to the median groove in the approximate anterior 1/2 of scutellum.

Diglyphomorphomyia fossa is similar to D. aequus Zhu & Huang, 2003 in sharing the antenna with a yellow scape, pedicel, and F1, while the remaining segments are brown; and the notauli straight and converging posteriorly to meet laterad to inner angles of axillae, but the new species can be separated from D. aequus by the following combination of characters: legs yellowish with fore and hind coxae yellowish white (legs yellow in D. aequus); gaster yellowish except margins brown (gaster yellow with a brown patch in D. aequus); gaster 1.7× as long as wide (gaster 1.4× as long as wide in D. aequus).

Holotype , ♀ [NEFU; on card], China, Hainan Province, Wenchang City, Dongjiao Town, 22–24 IV 2019, leg. Yu-Ting Jiang, by yellow pan trapping. Paratypes: 2♀ [on slides], same data as holotype.

Figures 11–16. 

D. hainana sp. nov., female, holotype 11 habitus in lateral view 12 gaster in dorsal view 13 head in frontal view 14 fore wing 15 habitus in dorsal view 16 hind wing. Scale bars: 100 μm.

Antennae yellowish brown with scape yellow. Midlobe of mesoscutum with two pairs of long setae. Legs mostly yellowish white with fore and hind coxae white, mid coxae yellow.

Female. Body length 1.8 mm, fore wing length 1.5 mm. Body yellow. Antennae yellowish brown with scape yellow. Legs mostly yellowish white except fore and hind coxae white, mid coxae yellow. Gaster dorsally mostly yellow with a brown patch and lateral margins brown, ventrally mostly whitish.

Head (Figs 11, 13) 1.4× as wide as high in frontal view and 2.4× as wide as long in dorsal view. Frons weakly sculptured. Vertex with engraved reticulation, meshes isodiametric. POL 2.4× OOL. Malar space 0.3× eye height. Occiput weakly reticulate. Relative measurements (length: width): scape = 29: 5; pedicel = 11: 5; F1 = 13: 5; F2 = 10: 5; F3 = 10: 6; F4 = 9: 6; clava = 15: 5.

Mesosoma (Fig. 15). Notauli straight, ending laterad to inner angle of axilla. Midlobe of mesoscutum punctate with two pairs of long setae, lateral lobe of mesoscutum reticulate. Axillae weakly reticulate and separated from each other. Scutellum longer than mesoscutum with two pairs of long setae, sublateral grooves meet posteriorly. Spiracle with a transverse carina anteriorly, slightly separated from metanotum by a distance shorter than a diameter of spiracle; each propodeal callus with seven or eight setae.

Wings. Fore wing (Fig. 14) 2.3× as long as wide. Speculum narrow. Relative measurements (length): SMV = 35; MV= 36; PMV= 16; STV= 12. Hind wing (Fig. 16) ~ 4.0× as long as wide.

Metasoma (Fig. 12). Gaster ovate; 1.8× as long as wide and 1.3× as long as mesosoma. Ovipositor exserted beyond apex of gaster.

Male. Unknown.

Unknown.

China (Hainan).

The specific name is derived from the type locality.

Diglyphomorphomyia hainana is similar to D. aequus Zhu & Huang, 2003 in sharing a body that is mostly yellow, and a gaster bearing a brown patch, but can be separated from D. aequus by the following combination of characters: antennae yellowish brown with scape yellow (antenna brown with scape, pedicel, and F1 yellow in D. aequus); POL 2.4× OOL (POL 2.8× OOL in D. aequus); legs mostly yellowish white with fore and hind coxae white, mid coxae yellow (legs yellow in D. aequus).

Holotype , ♀ [NEFU; on card], China, Jiangxi Province, Yichun City, Guanshan National Nature Reserve, 29 VIII 2017, leg. Guang-Xin Wang and Wen-Jian Li, by yellow pan trapping. Paratype: 1♀ [on slide], same data as holotype.

Figures 17–22. 

D. octoseta sp. nov., female, holotype 17 habitus in dorsal view 18 head in frontal view 19 fore wing 20 hind wing 21 habitus in lateral view 22 antenna. Scale bars: 100 μm.

The new species is easily distinguished from the other known members of the genus by the following combination of characters: Antenna with scape white, pedicel, F1–F3 pale yellow, clava brown except apex yellowish. Midlobe of mesoscutum punctate with four pairs of long setae. Propodeum with median carina bifurcate anteriorly and meeting a perpendicular lamina, anteromedially with two dorsal pits. Legs mostly white.

Female. Body length 2.2 mm, fore wing length 1.6 mm. Body pale yellow. Head yellowish-white. Antenna with scape white, pedicel, F1–F3 pale yellow, F4 and clava brown except apex yellowish. Mandibles yellow with teeth brown. Legs mostly white. Gaster mostly yellowish white, with a median stripe and lateral margins brown.

Head (Fig. 18) 1.4× as wide as high in frontal view and 2.3× as wide as long in dorsal view. Frons smooth to alutaceous with a row of setae along eye margin. Vertex smooth. POL 1.8× OOL. Malar space 0.4× eye height. Occiput weakly reticulate. Relative measurements (length: width): scape = 28: 5; pedicel = 9: 5; F1 = 14: 5; F2 = 11: 6; F3 = 11: 7; F4 = 11: 7; clava = 19: 7.

Mesosoma (Fig. 17). Midlobe of mesoscutum punctate with 4 pairs of long setae, lateral lobe of mesoscutum reticulate. Notauli ending laterad to inner angles of axilla. Axillae weakly reticulated and separated from each other. Scutellum longer than mesoscutum with 2 pairs of long setae, sublateral grooves meet posteriorly. Propodeum smooth, with a median carina bifurcating anteriorly and meeting a perpendicular lamina, anteromedially with two dorsal pits; plicae distinct with a transverse carina joining outer margins; another transverse carina present anterior to spiracle; separated from metanotum by a distance as long as a diameter of spiracle; each propodeal callus with seven long setae.

Wings. Fore wing (Fig. 19) 2.4× as long as wide. Relative measurements (length): SMV = 63; MV = 57; PMV = 25; STV = 22. Hind wing (Fig. 20) 3.9× as long as wide.

Metasoma (Fig. 17). Gaster ovate, 1.5× as long as wide and as long as mesosoma. Ovipositor exserted beyond apex of gaster.

Male. Unknown.

Unknown.

China (Jiangxi).

Latin: octo = eight; and refers to the midlobe of mesoscutum with four pairs of long setae.

Diglyphomorphomyia octoseta is similar to D. kairali Narendran & Girish Kumar in sharing a propodeum with a median carina bifurcating anteriorly and meeting a perpendicular lamina, but can be separated from the latter by the following combination of characters: fore wing hyaline without infuscation (fore wing with brown infuscation a short distance below STV in D. kairali); antenna with scape white, pedicel and F1–F3 pale yellow, clava brown except apex yellowish (antenna brownish black with scape and pedicel pale brownish yellow in D. kairali); midlobe of mesoscutum with four pairs of long setae (three pairs of long setae in D. kairali).