Tasactes interruptus Faust, 1894.

(modified from Morimoto 1978, 1985). Body small; integument black, antennae and tarsomeres reddish-brown; head, rostrum, pronotum, abdominal ventrites densely covered with punctures; eyes linear or oval laterally, distinctly separated ventrally; antennal funicle 6-segmented, antennal club transversely truncated with conically projecting velvety apex; scutellum very small, usually subtriangular; elytra usually bearing pilose pustules, striae distinct; metepisternum entirely covered by elytra; legs usually covered with dense short pubescence; procoxae contiguous; femora unarmed; claws free; male genitalia usually without parameres, temones longer than pedon; lamina of female sternite 8 usually bifurcated; collum of spermatheca usually more developed than ramus.

Holotype : ♂, labelled: printed: 西藏 波密县 易贡乡 S305省道11公里处 [Xīzàng, Bōmìxiàn, Yìgòngxiāng, S305 Shěngdào 11 Gōnglĭchù] / 30.1536°N, 94.9904°E / Alt. 2134 m / 2018.VIII.1 / 周润 [Zhōu Rùn] leg. // printed: IOZ(E)1965680. Paratypes: 6♂6♀, same data as holotype, but printed label: IOZ(E)1965681–1965687, IOZ(E)1965689–1965692, IOZ(E)1965694; 2♂3♀, labelled: printed: 西藏 易贡 [Xīzàng, Yìgòng] / Alt. 2300 m / 1978.VII.13, 17 / 李法圣 [Lĭ Făshèng] leg. // printed: IOZ(E)1507485–1507488, IOZ(E)1507491; 1♂4♀, labelled: printed: 西藏 波密 易贡 [Xīzàng, Bōmì, Yìgòng] / Alt. 2300 m / 1987.VIII.17 / 韩寅恒 [Hán Yínhéng] leg. // printed: IOZ(E)1507489, IOZ(E)1507490, IOZ(E)1507492–1507494; 1♀, labelled: printed: 西藏 林芝市 波密县 易贡乡 [Xīzàng, Línzhīshì, Bōmìxiàn, Yìgòngxiāng] / 30.2398°N, 96.8624°E / Alt. 2289 m / 2019.VII.19 / 周润 [Zhōu Rùn] 马茁 [Mă Zhuó] leg. // printed: IOZ(E)1965693; 1♀, labelled: printed: 西藏 林芝市 波密县 易贡乡 [Xīzàng, Línzhīshì, Bōmìxiàn, Yìgòngxiāng] / K12 / 30.1506°N, 94.9952°E / Alt. 2097 m / 2019.VII.20 / 周润 [Zhōu Rùn] 马茁 [Mă Zhuó] leg. // printed: IOZ(E)1965688; 1♀, labelled: printed: 西藏 林芝市 墨脱县 墨脱公路 62k 喜荣沟附近 [Xīzàng, Línzhīshì, Mòtuōxiàn, MòtuōGōnglù, 62k, Xĭrónggōufùjìn] / 29.7110°N, 95.5881°E / Alt. 2749 m / 2019.VII.24 / 周润 [Zhōu Rùn] 马茁 [Mă Zhuó] leg. // printed: IOZ(E)1965689.

Yigong Township (11 kilometres from S305 provincial road), Bomi County, Linzhi City, Xizang Autonomous Region, China.

Tasactes angustus sp. nov. morphologically is most similar to T. carinulatus, but distinguished by: (i) rostrum shorter than pronotum in both sexes, versus longer in T. carinulatus; (ii) pronotum sides rounded, lacking basal transverse depression, while sides subparallel with distinct basal transverse depression in T. carinulatus; (iii) elytral interstriae subequal in width and height, versus interstriae 1, 3, and 5 distinctly narrower and slightly lower in T. carinulatus; (iv) elytra more elongate with apical 1/6 conspicuously constricted, whereas lacking constriction in T. carinulatus.

(holotype, except female sternite 8 and genitalia).

Coloration (Fig. 1A, B). Body entirely black; antennal scape and funicle, and tarsomeres reddish brown.

Figure 1. 

Tasactes angustus sp. nov., holotype male. A. Dorsal habitus; B. Lateral habitus; C. Head, dorsal view; D. Head, lateral view; E. Eyes, ventral view; F. Pronotum, dorsal view; G. Ventrites, ventral view; H. Penis, lateral view; I. Penis, ventral view; J. Penis at apex, showing details of the pedon; K. Spiculum gastrale. Scale bars: 1 mm (A–D, F, G); 0.5 mm (H, I, K).

Head (Fig. 1C–E). Forehead flat, slightly narrower than rostrum at base; eyes elongate-oval, distinctly separated ventrally; rostrum elongate (Rl/Rw 3.13), shorter than pronotum (Rl/Pl 0.85), slightly curved in lateral view, base thick, basal 1/3 with dense short, pubescence and coarse punctures; antennae inserted slightly anterior to middle of rostrum; scape long (l/w 4.42), not reaching eyes, gradually broadening from base to apex, apical 1/3 markedly widened; funicular segments 1 and 2 elongate, segment 2 funnel-shaped, segments 4–6 transverse; club subobconical (l/w 3.25).

Pronotum (Fig. 1F). Longer than wide (Pl/Pw 1.04), widest posterior to middle, apical 1/6 distinctly constricted, sides rounded; disc slightly convex in lateral view, with dense, coarse punctures, punctures sparser on disc than laterally; densely covered with short pubescence; postocular lobes absent.

Scutellum. Very small, elongate-oval.

Elytra. Longer than wide (El/Ew 1.54), widest at basal 1/4, distinctly constricted at apical 1/6, sides rounded; disc nearly flat in lateral view; interstriae distinctly elevated, subequal in width, with dense, short pubescence; striae deep, punctures elongate-oval; distance between punctures subequal to a puncture length; punctures with dense short pubescence.

Abdomen (Fig. 1G). Abdominal ventrites densely covered with coarse punctures; ventrite 2 with anterior margin slightly convex at middle, posterior margins of ventrites 2–4 rectilinear; ventrite 2 0.8 times length of ventrite 1, ventrite 3 slightly longer than ventrite 4, ventrite 5 1.9 times as wide as long.

Legs. Densely covered with short pubescence; femora and tibiae with punctures; procoxae subconical, contiguous; profemur more robust than mesofemur and metafemur, femora unarmed; profemur 4.3 times as long as wide; tibiae bearing single long uncus; protibia 6.0 times as long as wide; tarsi long, tarsomeres 1–3 obconical, ventrally with dense erect setae, onychium elongate; claws free, divergent; protarsomere 1 1.7 times as long as wide, tarsomeres 2 and 3 each 1.3 times, onychium 4.0 times.

Male genitalia (Fig. 1H–K). Pedon 0.4 times length of temones, evenly curved in lateral view, sides subparallel, base symmetrical, apex slightly narrowed; temones slender, slightly curved; manubrium of tegmen long, evenly curved from middle to apex, slightly wider than temones; spiculum gastrale robust, evenly curved; basal plate bifurcate, basal arms opposed, upper part of each basal arm approximately triangular, length subequal to width, apices with rounded angles.

Female sternite 8 and genitalia (Fig. 2G–I). Sternite 8 with apodeme 1.5 times length of lamina; lamina bifurcate at base, sides slightly curved, apex with sparse setae; gonocoxites cylindrical, apices with dense setae; styli short, cylindrical, width approximately 1/2 width of gonocoxite apices, apices with setae; spermatheca with robust and curved cornu; corpus large; ramus and collum not developed.

Figure 2. 

Tasactes angustus sp. nov., paratype female (IOZ(E)1965681). A. Dorsal habitus; B. Lateral habitus; C. Head, dorsal view; D. Head, lateral view; E. Pronotum, dorsal view; F. Ventrites, ventral view; G. Sternite 8; H. Ovipositor; I. Spermatheca. Scale bars: 1 mm (A–F); 0.25 mm (G–I).

Male paratypes. Measurements (in mm) (n = 9): Bl: 3.40–4.22 (3.87). Rl: 1.00–1.23 (1.16), Rw: 0.32–0.39 (0.36). Pl: 1.13–1.45 (1.30), Pw: 1.10–1.40 (1.26). El: 2.08–2.58 (2.40), Ew (Bw): 1.35–1.69 (1.55).

Female paratypes. Measurements (in mm) (n = 16): Bl: 3.50–4.40 (3.94). Rl: 1.10–1.45 (1.27), Rw: 0.30–0.48 (0.39). Pl: 1.10–1.50 (1.32), Pw: 1.08–1.47 (1.27). El: 2.20–2.50 (2.43), Ew (Bw): 1.31–1.80 (1.53). Illustrations of a female are provided (Fig. 2A–I).

Male body slightly smaller than that of female; rostrum shorter in male; smooth from apical 1/3 to apex in male, smooth and shiny from middle to apex in female; antennae inserted slightly anterior to middle of rostrum in male, at middle in female; ventrites without distinct differences between sexes.

Bomi County and Medog County, Linzhi City, Xizang Autonomous Region, China (Fig. 9).

The species name is a Latin masculine adjective angustus (narrow), referring to the significantly narrower body width compared to other species within the genus.

Holotype : ♂, labelled: printed: 四川 宝兴 锅巴岩 [Sìchuān, Băoxīng, Guōbāyán] / B17 / Alt. 3080 m / 杯诱 [bēiyòu] / 2001.VII.1–4 / 于晓东 [Yú xiăodōng] 周红章 [Zhōu hóngzhāng] leg. // printed: IOZ(E)1965700. Paratype: 1♀, same data as holotype, except a printed label: IOZ(E)1965701.

Guoba Rock, Baoxing County, Yaan City, Sichuan Province, China.

Tasactes baoxingensis sp. nov. resembles T. dudkoi but differs in the following characters: (i) body smaller (length 4.20–4.40 mm vs 5.40–6.20 mm in T. dudkoi); (ii) pronotum more distinctly constricted apically, lacking median carina (vs weak carina present in T. dudkoi), and postocular lobes absent (vs weakly developed in T. dudkoi); (iii) elytral pilose pustules distinctly wider than in T. dudkoi (see Legalov 2021: fig. 1); (iv) length ratio of pedon to temones exceeding that in T. dudkoi (see Legalov 2021: fig. 2).

(holotype, except female sternite 8 and genitalia).

Coloration (Fig. 3A, B). Body entirely black; antennal scape and funicle, and tarsomeres reddish brown.

Figure 3. 

Tasactes baoxingensis sp. nov., holotype male. A. Dorsal habitus; B. Lateral habitus; C. Head, dorsal view; D. Head, lateral view; E. Eyes, ventral view; F. Pronotum, dorsal view; G. Ventrites, ventral view; H. Penis, lateral view; I. Penis, ventral view; J. Penis at apex, showing details of the pedon; K. Spiculum gastrale. Scale bars: 1 mm (A–D, F, G); 0.5 mm (H, I, K).

Head (Fig. 3C–E). Forehead flat, slightly narrower than rostrum at base; eyes elongate-oval, distinctly separated ventrally; rostrum elongate (Rl/Rw 3.80), longer than pronotum (Rl/Pl 1.27), curved in lateral view, from base to apical 1/6 with short pubescence, apex with dense punctures; antennae inserted at apical 1/3 of rostrum; scape long (l/w 5.18), not reaching eyes, gradually widening from base to apex, apical 1/3 markedly widened; funicular segments 1 and 2 elongate, segment 1 1.3 times as long as segment 2, segment 2 funnel-shaped, segments 4–6 transverse; club subconical (l/w 2.00).

Pronotum (Fig. 3F). Wider than long (Pl/Pw 0.97), widest at middle, apical 1/6 distinctly constricted, gradually narrowed from apical 1/4 to base; disc flat in lateral view, densely covered with coarse, deep punctures; distance between punctures much smaller than a puncture diameter; dense short pubescence present; postocular lobes absent.

Scutellum. Small, subtriangular.

Elytra. Longer than wide (El/Ew 1.16), widest at middle, sides rounded; disc nearly flat in lateral view; interstriae slightly convex, subequal in width, with dense short pubescence, odd interstriae bearing interrupted oval pilose pustules, pustules hemispherical in lateral view, width 2.0 times interstriae width; striae deep, punctures large, with dense pubescence; distance between punctures subequal to a puncture diameter.

Abdomen (Fig. 3G). Abdominal ventrites densely covered with coarse punctures; ventrite 2 with anterior margin slightly convex at middle, posterior margins of ventrites 2–4 rectilinear; ventrite 2 0.9 times length of ventrite 1, ventrite 3 slightly longer than ventrite 4, ventrite 5 2.3 times as wide as long.

Legs. Densely covered with short pubescence; femora and tibiae with punctures; procoxae subconical, contiguous; profemur more robust than mesofemur and metafemur, femora unarmed; profemur 3.8 times as long as wide; tibiae bearing single long uncus; protibia 5.1 times as long as wide; tarsi long, tarsomeres 1–3 obconical, ventrally with setae, onychium elongate; claws free, divergent; protarsomere 1 1.7 times as long as wide, tarsomere 2 and 3 each 1.3 times, onychium 3.5 times.

Male genitalia (Fig. 3H–K). Pedon 0.3 times longer than temones, curved in lateral view, sides subparallel, base symmetrical, apex slightly narrowed; temones slender, slightly curved; manubrium of tegmen robust, elongate, slightly curved, approximately 3.0 times as wide as temones; spiculum gastrale robust, evenly curved; basal plate bifurcate, basal arms opposed, upper part of each basal arm approximately triangular, length subequal to width, apices with rounded angles.

Female sternite 8 and genitalia (Fig. 4G–I). Sternite 8 with apodeme length subequal to that of lamina; lamina bifurcate at middle, sides curved, apex with sparse setae; gonocoxites cylindrical, apices with dense setae; styli short, cylindrical, width approximately 1/3 width of gonocoxite apices, apices with short setae; spermatheca with curved, apically rounded cornu; corpus robust; ramus longer than collum.

Figure 4. 

Tasactes baoxingensis sp. nov., paratype female (IOZ(E)1965701). A. Dorsal habitus; B. Lateral habitus; C. Head, dorsal view; D. Head, lateral view; E. Pronotum, dorsal view; F. Ventrites, ventral view; G. Sternite 8; H. Ovipositor; I. Spermatheca. Scale bars: 1 mm (A–F); 0.25 mm (G–I).

Male holotype. Measurements (in mm): Bl: 4.52. Rl: 1.90, Rw: 0.50. Pl: 1.50, Pw: 1.55. El: 2.90, Ew (Bw): 2.50.

Female paratype. Measurements (in mm): Bl: 5.38. Rl: 2.00, Rw: 0.50. Pl: 1.80, Pw: 1.90. El: 2.61, Ew (Bw): 2.70. Illustrations of a female are provided (Fig. 4A–I).

Female rostrum smooth and shiny from middle to apex, while male rostrum smooth only at apex; female antennae inserted at middle of rostrum, whereas male antennae inserted at apical 1/3.

Known only from the type locality in Sichuan Province, China (Fig. 9).

This species is named after its type locality, Baoxing County. Adjective, variable.

Holotype : ♂, labelled: printed: 西藏 林芝市 墨脱县 背崩乡 阿苍村 [Xīzàng, Línzhīshì, Mòtuōxiàn, Bèibēngxiāng, Acāngcūn] / 2019.VIII.09 // 29.2453°N, 95.1300°E / Alt. 1409 m / 周润 [Zhōu Rùn] 马茁 [Mă Zhuó] leg. // printed: IOZ(E)1965695. Paratypes: 2♀, same data as holotype, but printed label: IOZ(E)1965696 and IOZ(E)1965697 respectively.

Acang Village, Beibeng Township, Medog County, Linzhi City, Xizang Autonomous Region, China.

Tasactes ocellatus sp. nov. is most similar to T. carinulatus but differs in the following characters: (i) body smaller (length 3.65–3.89 mm, width 1.66–1.68 mm vs length 4.20 mm, width 1.80 mm in T. carinulatus); (ii) rostrum shorter than pronotum in both sexes, whereas longer than pronotum in T. carinulatus; (iii) pronotum lacking basal transverse depression, while distinct basal transverse depression present in T. carinulatus; (iv) elytral punctures subequal in size to pronotal punctures, while 2.0 times as large as pronotal punctures in T. carinulatus. Tasactes ocellatus sp. nov. geographically closest to T. angustus sp. nov., both occurring in Medog County, but differing in: (i) eyes barely visible ventrally, versus distinctly visible in T. angustus sp. nov.; (ii) rostrum shorter (Rl 0.95–1.05 mm vs Rl 1.00–1.45 mm in T. angustus sp. nov.); (iii) antennal scape shorter and stouter (l/w 3.78 vs l/w 4.42 in T. angustus sp. nov.); (iv) pronotum sides subparallel, versus sides curved in T. angustus sp. nov.; (v) elytral interstriae 1–3 flat, bearing pilose pustules, whereas uniformly convex, lacking pustules in T. angustus sp. nov.; (vi) pedon apex acutely narrowed, manubrium shorter than temones, while apex slightly narrowed, manubrium subequal to temones in T. angustus sp. nov.; (vii) basal arms of spiculum gastrale slender and linear, as compared to subtriangular in T. angustus sp. nov.; (viii) styli width approximately 1/4 width of gonocoxite apices, while 1/2 in T. angustus sp. nov.

(holotype, except female sternite 8 and genitalia).

Coloration (Fig. 5A, B). Body entirely black; antennal scape and funicle, and tarsomeres reddish brown.

Figure 5. 

Tasactes ocellatus sp. nov., holotype male. A. Habitus dorsal; B. Lateral habitus; C. Head, dorsal view; D. Head, lateral view; E. Eyes, ventral view; F. Pronotum, dorsal view; G. Ventrites, ventral view; H. Penis, lateral view; I. Penis, ventral view; J. Penis at apex, showing details of the pedon; K. Spiculum gastrale. Scale bars: 1 mm (A–D, F, G); 0.5 mm (H, I, K).

Head (Fig. 5C–E). Forehead flat, 0.5 times width of rostrum at base; eyes small, oval, barely visible ventrally; rostrum elongate (Rl/Rw 1.96), shorter than pronotum (Rl/Pl 0.73), slightly curved in lateral view, base thick, densely covered with punctures, bearing short pubescence; antennae inserted slightly anterior to middle of rostrum; scape long (l/w 3.78), not reaching eyes, gradually widening from base to apex, middle markedly widened; funicular segments 1 and 2 elongate, segment 2 funnel-shaped, segments 4–6 transverse; club subobconical (l/w 1.64).

Pronotum (Fig. 5F). Longer than wide (Pl/Pw 1.18), widest at middle, apical 1/5 distinctly constricted, sides subparallel; disc slightly convex in lateral view, with dense and coarse punctures; distance between punctures slightly exceeding puncture diameter, punctures sparser on disc than laterally; densely covered with short pubescence; postocular lobes absent.

Scutellum. Very small, subtriangular.

Elytra. Longer than wide (El/Ew 1.44), widest at basal 1/4, sides rounded; disc slightly convex in lateral view; interstriae slightly convex, subequal in width, interstriae 3 and 5 basally, interstriae 1–5 from middle to apex bearing pilose pustules forming indistinct V-shaped pattern; striae deep, punctures rounded, bearing dense, short pubescence; distance between punctures slightly exceeding puncture diameter.

Abdomen (Fig. 5G). Abdominal ventrites densely covered with coarse punctures; ventrite 2 with anterior margin slightly convex at middle, posterior margins of ventrites 2–4 rectilinear; ventrite 2 0.6 times length of ventrite 1, ventrite 3 slightly longer than ventrite 4, ventrite 5 2.3 times as wide as long.

Legs. Densely covered with short pubescence; femora and tibiae with punctures; procoxae subconical, contiguous; profemur more robust than mesofemur and metafemur, femora unarmed; profemur 3.9 times as long as wide; tibiae bearing single long uncus; protibia 5.7 times as long as wide; tarsi long, tarsomeres 1–3 obconical, ventrally with erect setae, onychium elongate; claws free, divergent; protarsomere 1 1.7 times as long as wide, tarsomeres 2 and 3 each 1.1 times, onychium 4.2 times.

Male genitalia (Fig. 5H–K). Pedon 0.3 times length of temones, evenly curved in lateral view, sides subparallel, base symmetrical, apex distinctly narrowed; temones slender, slightly curved; manubrium of tegmen long, 0.7 times length of temones, slightly curved, wider than temones; spiculum gastrale robust, evenly curved; basal plate bifurcate, basal arms slender, opposed, apices acute.

Female sternite 8 and genitalia (Fig. 6G–I). Sternite 8 with apodeme 1.5 times length of lamina; lamina bifurcate at base, sides curved and depressed, apex with sparse setae; gonocoxites cylindrical, apices with dense setae; styli short, cylindrical, width approximately 1/4 width of gonocoxite apices, apices with short setae; spermatheca with robust and curved cornu; corpus large; ramus and collum not developed.

Figure 6. 

Tasactes ocellatus sp. nov., paratype female (IOZ(E)1965696). A. Dorsal habitus; B. Lateral habitus; C. Head, dorsal view; D. Head, lateral view; E. Pronotum, dorsal view; F. Ventrites, ventral view; G. Sternite 8; H. Ovipositor; I. Spermatheca. Scale bars: 1 mm (A–F); 0.25 mm (G–I).

Male holotype. Measurements (in mm): Bl: 3.89. Rl: 0.98, Rw: 0.50. Pl: 1.33, Pw: 1.13. El: 2.38, Ew (Bw): 1.68.

Female paratypes. Measurements (in mm) (n = 2): Bl: 3.65–3.85 (3.75). Rl: 0.95–1.05 (1.00), Rw: 0.39–0.40 (0.40). Pl: 1.24–1.3 (1.27), Pw: 1.09–1.01 (1.10). El: 2.10–2.35 (2.23), Ew (Bw): 1.55–1.65 (1.60). Illustrations of a female are provided (Fig. 6A–I).

Female rostrum slenderer than that of male; male antennae inserted slightly anterior to middle of rostrum, female antennae inserted at middle of rostrum; ventrites without distinct differences between sexes.

Known only from the type locality in Xizang, China (Fig. 9).

The species name is a Latin masculine adjective ocellatus (having small eyes), referring to the significantly reduced eyes compared to other species within the genus.

Holotype : ♂, labelled: printed: 西藏 林芝市 巴宜区 排龙乡 迫龙沟 [Xīzàng, Línzhīshì, Bāyíqū, Páilóngxiāng, Pòlónggōu] / D2 / 30.02421°N, 95.00770°E / Alt. 1923 m / 2018.VIII.3 / 周润 [Zhōu Rùn] leg. // printed: IOZ(E)1965698. Paratype: 1♀, same data as holotype, except a printed label: IOZ(E)1965699.

Polong Gully, Pailong Township, Bayi District, Linzhi City, Xizang Autonomous Region, China.

Tasactes pilosus sp. nov. resembles T. dudkoi but differs unequivocally in: (i) body smaller (length 4.20–4.40 mm vs 5.40–6.20 mm in T. dudkoi); (ii) antennal scape shorter and stouter (l/w 4.75 vs l/w 6.70 in T. dudkoi); (iii) pronotum lacking median carina, whereas with weak median carina in T. dudkoi; (iv) pronotum bearing median longitudinal pilose pustule, while the latter is absent in T. dudkoi (see Legalov 2021: fig. 1); (v) temones distinctly more slender than in T. dudkoi (see Legalov 2021: fig. 2).

(holotype, except female sternite 8 and genitalia).

Coloration (Fig. 7A, B). Body entirely black; antennal scape and funicle, and tarsomeres reddish brown.

Figure 7. 

Tasactes pilosus sp. nov., holotype male. A. Dorsal habitus; B. Lateral habitus; C. Head, dorsal view; D. Head, lateral view; E. Eyes, ventral view; F. Pronotum, dorsal view; G. Ventrites, ventral view; H. Penis, lateral view; I. Penis, ventral view; J. Penis at apex, showing details of the pedon; K. Spiculum gastrale. Scale bars: 1 mm (A–D, F, G); 0.5 mm (H, I, K).

Head (Fig. 7C–E). Forehead flat, slightly narrower than rostrum base width; eyes elongate-oval, distinctly separated ventrally; rostrum elongate (Rl/Rw 5.16), longer than pronotum (Rl/Pl 1.10), evenly curved in lateral view, from base to apical 1/6 with short pubescence, apex with dense punctures; antennae inserted at apical 1/3 of rostrum; scape long (l/w 4.75), not reaching eyes, gradually widening from base to apex, apical 1/3 markedly widened; funicular segments 1 and 2 elongate, segment 2 funnel-shaped, segments 4–6 transverse; club subobconical (l/w 1.66).

Pronotum (Fig. 7F). Longer than wide (Pl/Pw 1.07), widest at middle, apical 1/8 distinctly constricted, sides rounded; disc slightly convex in lateral view, densely covered with coarse punctures, punctures sparser on disc than laterally; dense, short pubescence forming median longitudinal pilose pustule; postocular lobes weak.

Scutellum. Small, subtriangular.

Elytra. Longer than wide (El/Ew 1.27), widest at basal 1/4, apical 1/6 distinctly constricted, sides rounded; disc nearly flat in lateral view; interstriae convex, subequal in width, with dense short pubescence, interstriae 1–8 bearing interrupted longitudinal pilose pustules, pustule width subequal to interstrial width; striae deep, punctures large, bearing dense, short pubescence; distance between punctures exceeding puncture diameter.

Abdomen (Fig. 7G). Abdominal ventrites densely covered with coarse punctures; ventrite 2 with anterior margin slightly convex at middle, posterior margins of ventrites 2–4 rectilinear; ventrite 2 0.8 times length of ventrite 1, ventrite 3 slightly longer than ventrite 4, ventrite 5 2.0 times as wide as long.

Legs . Densely covered with short pubescence; femora and tibiae with punctures; procoxae subconical, contiguous; profemur more robust than mesofemur and metafemur, femora unarmed; profemur 3.3 times as long as wide; tibiae bearing single long uncus; protibia 6.2 times as long as wide; tarsi long, tarsomeres 1–3 obconical, ventrally with setae, onychium elongate; claws free, divergent; protarsomere 1 1.8 times as long as wide, tarsomere 2 1.3 times, tarsomere 3 1.4 times, onychium 4.3 times.

Male genitalia (Fig. 7H–K). Pedon 0.2 times length of temones, curved in lateral view, sides curved, base symmetrical, apex broad and not narrowed; temones slender, slightly curved; manubrium of tegmen very robust, elongate, apex curved, approximately 3.0 times as wide as temones; spiculum gastrale robust, evenly curved; basal plate bifurcate, basal arms opposed, upper part of each basal arm approximately triangular, length subequal to width, apices with rounded angles.

Female sternite 8 and genitalia (Fig. 8G–I). Sternite 8 with apodeme 0.8 times length of lamina; lamina bifurcate at base, sides curved, apex with sparse setae; gonocoxites cylindrical, apices with dense setae; styli short, cylindrical, width approximately 1/4 width of gonocoxite apices, apices with short setae; spermatheca with curved, apically rounded cornu; corpus robust; ramus and collum weakly developed.

Figure 8. 

Tasactes pilosus sp. nov., paratype female (IOZ(E)1965699). A. Dorsal habitus; B. Lateral habitus; C. Head, dorsal view; D. Head, lateral view; E. Pronotum, dorsal view; F. Ventrites, ventral view; G. Sternite 8; H. Ovipositor; I. Spermatheca. Scale bars: 1 mm (A–F); 0.25 mm (G–I).

Male holotype. Measurements (in mm): Bl: 4.20. Rl: 1.65, Rw: 0.32. Pl: 1.50, Pw: 1.40. El: 2.42, Ew (Bw): 1.90.

Female paratype. Measurements (in mm): Bl: 4.40. Rl: 1.60, Rw: 0.35. Pl: 1.51, Pw: 1.45. El: 2.61, Ew (Bw): 1.98. Illustrations of a female are provided (Fig. 8A–I).

Female rostrum smooth and shiny from middle to apex, while male rostrum smooth only at apex; female antennae inserted at middle of rostrum, whereas male antennae inserted at apical 1/3.

Known only from the type locality in Xizang, China (Fig. 9).

Figure 9. 

Distribution of Tasactes species in China (based on specimens examined in this study).

The specific name is derived from the Latin word pilosus (hairy), referring to the dense pubescence on the pronotum, particularly the distinct longitudinal tuft of pubescence medially. Adjective, variable.