(6 ♂♂, 1 ♀). China, Shaanxi: 3 ♂♂, 1 ♀, Hanzhong City, Nanzheng County, Yuanba Town, Liping National F. P., 32°50'N, 106°36'E, 1400–1600 m, 16–VII–2012, Li et al. leg. Hubei: 1 ♂, Wufeng County, Houhe National Reserve, 1100 m, 30°04'N, 110°37'E, 30–IV–2004, Li leg. Guizhou: 1 ♂, Tongren City, Fanjing Shan, Hu & Tang leg.; 1 ♂, Yanhe County, Wanjia Village, Mayanghe N. R., 900 m, 28°51'N, 108°21'E, 03–X–2007, Zhu leg.

The known distribution is confined to the Daba Shan (Assing 2012) and the Wuling Shan in Hubei, Guizhou, and Shaanxi.

(2 ♂♂). Holotype, ♂: “China, Guangxi, Lingui County, Anjiangping, 1700 m, 25°33'N, 109°55'E, 17–VII–2011, Peng Zhong leg. / Holotype ♂, Lobrathium anatinum, sp. n. Li & Li, det. 2013”. Paratype, ♂: “China, Guangxi, Lingui County, Anjiangping, 1400–1700 m, 25°33'N, 109°56'E, 14–VII–2011, Peng Zhong leg. / Paratype ♂, Lobrathium anatinum, sp. n. Li & Li, det. 2013”.

Body length 7.28–7.89 mm, length of fore body 3.89–4.0 mm. Habitus as in Fig. 2A. Coloration: body black with distinct bluish hue, middle of elytra with yellowish spot not reaching lateral and posterior margins; legs blackish with paler tarsi, antennae dark brownish to blackish.

Head weakly transverse (HW/HL = 1.10–1.11), widest across eyes; posterior angles broadly rounded; punctation dense and moderately coarse, sparser in median dorsal portion; interstices without microsculpture. Eyes large, more than half as long as distance from posterior margin of eye to neck in dorsal view. Antenna long and slender, 1.96–2.22 mm long.

Pronotum 1.24–1.30 times as long as broad, as wide as head (PW/HW = 1.0), lateral margins convex in dorsal view, punctation similar to that of head, but with impunctate midline, interstices glossy.

Elytra wider than pronotum and nearly as long as pronotum (EL/EW = 0.95–1.0, EW/PW = 1.15–1.3, EL/PL = 0.91–0.94); punctation coarse and dense, arranged in series; interstices without microsculpture. Hind wings apparently present.

Abdomen broader than elytra; punctation fine and dense; posterior margin of tergite VII with palisade fringe.

Male. Sternite VII (Fig. 2D) strongly transverse and with distinct median impression, this impression without pubescence, posterior margin broadly concave; sternite VIII (Fig. 2E) weakly transverse, with long and pronounced postero-median impression, this impression with numerous modified, stout and short black setae, posterior excision moderately broad and moderately deep, on either side of this excision with long dark setae; aedeagus (Figs 2B, C) 1.70–1.72 mm long, ventral process long, flattened, and apically convex in ventral view.

Female. Unknown.

The specific epithet (Latin, adjective: of a duck) refers to the shape of the ventral process of the aedeagus, which somewhat resembles the mouth of a duckbill.

This species is close to Lobrathium ablectum Assing (2012) in sharing a similar shape and chaetotaxy of the sternites VII and VIII. The new species differs from Lobrathium ablectum by larger body size, and by the longer, apically not bifid ventral process of the aedeagus.

The present species was sifted from wet moss near a cold stream (Fig. 20A) in the Angjiangping National Reserve, Guangxi (Fig. 19), in July.

(1 ♂). China, Jiangxi: 1♂, Jinggangshan City, Ciping Town, 850 m, 26°29'N, 114°05'E, 18–X–2010, Peng et al. leg.

The original description of Lobrathium bispinosum is based on specimens from Guizhou (Assing 2012). The above record from Jiangxi extends the distributional range eastwards about 700 kilometers.

(2 ♂♂). China, Yunnan: 1 ♂, Hutiaoxia, Jinxing, 1800 m, 27°11'N, 100°06'E, 22–IV–2005, Huang leg. Qinghai: 1 ♂, Menda N. R., 2500 m, 35°47'N, 107°48'E, 24–VII–2004, Hu et al. leg.

The original description of Lobrathium configens is based on specimens from Hubei, Sichuan, Yunnan, and Shaanxi (Assing 2012). The above records extend the wide distributional range of Lobrathium configens southwards by about 1200 kilometers.

(1 ♂). China, Sichuan: 1 ♂, Tianquan County, Erlang Shan, Yakou 3.6 km, 29°31'N, 102°17'E, 2600–2800m, 11–VII–2012, Peng et al. leg.

Sichuan.

(47 ♂♂, 49 ♀♀). China, Zhejiang: 17 ♂♂, 12 ♀♀, Anji County, Longwang Shan, 950–1200 m, 25–IV–2006, Shen et al. leg.; 8 ♂♂, 14 ♀♀, Anji County, Longwang Shan, 950–1200 m, 25–IV–2004, Tang et al. leg.; 2 ♂♂, 1 ♀, Anji County, Longwang Shan, 300–500 m, 23–IV–2004, Zhu leg.; 11 ♂♂, 12 ♀♀, Anji County, Longwang Shan, 03–X–2003, Hu et al. leg.; 8 ♂♂, 8 ♀♀, Lin’an City, East Tianmu Shan, 1050–1150 m, 13–IV–2011, Peng & Zhu leg.; 1 ♂, 2 ♀♀, Tianmu Shan, Gaoling, 800 m, 26–IV–2008, He & Tang leg.

The original description of Lobrathium demptum is based on specimens from the Dabie Shan, Hubei (Assing 2012). The above records from Zhejiang extend the range towards the southeast by about 400 kilometers.

(10 ♂♂, 16 ♀♀). Holotype, ♂: “China, Hainan, Lingshui County, Diaoluo Shan, 1000 m, 18°43'N, 109°51'E, 24–IV–2012, Peng Zhong & Dai Cong-chao leg. / Holotype ♂, Lobrathium diaoluoense, sp. n., Li & Li, det. 2013”. Paratypes, 9 ♂♂, 16 ♀♀: same data as holotype.

Body length 4.61–5.95 mm, length of fore body 2.94–3.28 mm. Habitus as in Fig. 7A. Coloration: body black, posterior portion of elytra with yellowish spot reaching posterior and lateral margins; legs with paler tarsi; antennae yellowish.

Head as long as broad or weakly oblong (HL/HW = 1.0–1.09); posterior angles marked; punctation coarse and dense, sparser in median dorsal portion, interstices without microsculpture. Eyes large, more than half as long as distance from posterior margin of eye to neck. Antenna slender, 1.54–1.78 mm long.

Pronotum slender, approximately as wide as head (PL/PW = 1.25–1.31, PW/HW = 0.96–1.0), lateral margins weakly convex in dorsal view; punctation dense and coarse, similar to that of head, median dorsal portion more sparsely punctate or impunctate; interstices without microsculpture and glossy.

Elytra longer and broader than pronotum (EL/EW = 1.09–1.15, EW/PW = 1.24–1.37, EL/PL = 1.11–1.14); humeral angles marked; punctation coarse and dense, interstices without microsculpture and glossy. Hind wings fully developed.

Abdomen distinctly narrower than elytra; punctation fine and dense; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII weakly concave, without appreciable sexual dimorphism.

Male. Sternite VII (Fig. 7D) with deep and broad median impression without pubescence, posterior margin broadly and rather strongly concave; sternite VIII oblong, with deep and large U-shaped posterior excision (Fig. 7F), without modified setae, on either side of posterior excision with long dark setae; aedeagus (Figs 7B, C) with ventral process of very distinctive morphology, furcate apically, and this bifurcation forming an angle of less than 30 degrees in lateral view.

Female. Posterior margin of tergite VIII (Fig. 7G) weakly convex; sternite VIII (Fig. 7H) of similar shape as tergite VIII; tergite IX (Fig. 7I) undivided anteriorly; tergite X of subovoid shape.

The specific epithet (adjective) is derived from the Diaoluo Shan where the type locality is situated.

This species is similar to Lobrathium bipeniculatum Assing (2010) and Lobrathium pengi Li & Li sp. n. (described below) in sharing similar shapes of the male sternites VII and VIII, and of the aedeagus. It can be separated from Lobrathium bipeniculatum by the broader median impression of the male sternite VII (Fig. 7D), and by the absence of clusters of long dark setae at the margins of the posterior excision of the male sternite VIII (Fig. 7F). In Lobrathium pengi, the ventral process of the aedeagus is of different shape, with the apical bifurcation forming an angle of more than 30 degrees in lateral view.

The present species was sifted from wet moss on stones alongside a reservoir (red circle in Fig. 20B) in the Diaoluo Shan, Hainan (Fig. 19), in April.

(1 ♂, 2 ♀♀). Holotype, ♂: “China, Hubei, Wufeng County, Houhe National Reserve, 30–IV–2004, 1100 m, 30°04'N, 110°37'E, Li Li-zhen leg. / Holotype ♂, Lobrathium dufui, sp. n. Li & Li, det. 2013”. Paratypes, 2 ♀♀: same data as holotype.

Body length 5.84–6.89 mm, length of fore body 3.34–3.61 mm. Habitus as in Fig. 8A. Coloration: body black, posterior portion of elytra with oblong yellowish spot of at least 2/5 the length of elytra and reaching posterior margins and lateral margins; legs blackish with slightly paler tibiae and tarsi; antennae brown.

Head weakly transverse (HW/HL = 1.02–1.09), widest at eyes, weakly tapering behind eyes; posterior angles rounded, not marked; punctation coarse and moderately dense, sparser in median dorsal portion and on frons; interstices without microsculpture. Eyes large, more than half the length of postocular region from posterior margin of eyes to neck in dorsal view. Antenna slender, 1.72–2.18 mm long.

Pronotum approximately as wide as head (PL/PW = 1.25–1.31, PW/HW = 0.96–1.10); lateral margins weakly convex in dorsal view; punctation dense and coarse, similar to that of head, but with impunctate midline; interstices without microsculpture and glossy.

Elytra broader than pronotum (EL/EW = 1.02–1.06, EW/PW = 1.21–1.39, EL/PL = 1.01–1.08); humeral angles marked; punctation coarse and dense. Hind wings apparently present.

Abdomen distinctly narrower than elytra; punctation fine and dense; posterior margin of tergite VII with palisade fringe; tergite VIII (Fig. 8F) without appreciable sexual dimorphism, posterior margin broadly convex.

Male. sternite VII (Fig. 8D) transverse and posteriorly with pronounced impression of triangular shape, this impression impunctate in the middle and laterally with a few modified, stout and short black setae, posterior margin broadly and weakly concave; sternite VIII (Fig. 8E) weakly transverse, with deep and broad, U-shaped posterior excision, median impression furnished with numerous modified, stout, short and black setae; aedeagus (Figs 8B, C) with ventral process of very distinctive morphology, apically with fissure and bifid.

Female. Sternite VIII (Fig. 8G) weakly transverse, posteriorly convex; tergite IX (Fig. 8H) undivided anteriorly, anterior margin emarginated in the middle; tergite X of subovoid shape.

The species is named after the famous late poet Fu Du, who was born in Hubei.

This species is similar to Lobrathium uncinatum Li & Li sp. n. (described below) in external characters, and to Lobrathium hebeatum Zheng (1988) in sexual characters. It differs from Lobrathium uncinatum by the shape of the aedeagus and by the absence of modified setae on the male sternite VI, and from Lobrathium hebeatum by the shape of the apex of the ventral process of the aedeagus.

The type specimens were sifted from wet moss near a stream (Fig. 20C) in Hubei (Fig. 19).

(6 ♂♂, 8 ♀♀). China, Shaanxi: 4 ♂♂, 5 ♀♀, Foping N. R., 1400–1800 m, 33°31'N, 107°56'E, 19–VII–2004, Hu et al. leg.; 1 ♂, 1 ♀, Taibai Shan, 1450–1750 m, 34°03'N, 107°53'E – 33°53'N, 107°48'E, 15–VII–2004, Hu & Tang leg. Sichuan: 1 ♂, 2 ♀♀, Luding County, Hailuogou, 3000 m, 29°44'N, 102°07'E, 25–VII–2006, Hu & Tang leg.

Sichuan, Yunnan, Shaanxi.

(67 ♂♂, 84 ♀♀). China, Fujian: 1 ♂, 1 ♀, Guihe Village, Meihua Shan, 1200 m, 25°19'N, 116°51'E, 31–V–2007, Huang & Xu leg. Guizhou: 1 ♂, 1 ♀, Suiyang County, Kuankuoshui N. R., Baishaogou, 700 m, 28°10'N, 107°16'E, 04–VI–2010, Lu et al. leg. Yunnan: 3 ♂♂, 1 ♀, Nabanhe N. R., Chuguohe, Bengganghani, 1750 m, 28–IV–2009, Hu & Yin leg. Zhejiang: 1 ♂, 2 ♀♀, Zhuji City, Dongbai Shan, 200 m, 29°31'N, 120°25'E, 06–V–2012, Zhao leg.; 8 ♂♂, 12 ♀♀, Wuyanling N. R., 700 m, 10–IV–2004, Hu et al. leg.; 7 ♂♂, 13 ♀♀, Wenzhou City, Yandang Shan, 50–350 m, 29–V–2006, Li & Shen leg.; 1 ♂, 1 ♀, Pan’an County, Dapan Shan, 550–800 m, 06–VI–2006, Li & Shen leg.; 25 ♂♂, 22 ♀♀, Baishanzu N.R., 1200–1360 m, 05–V–2004, Hu et al. leg.; 20 ♂♂, 31 ♀♀, Gutian N. R., 5~7–V–2005, Zhu & Li leg.

For illustrations of the female sexual characters see Figs 10G–H.

Widespread species, recorded from Jiangsu, Zhejiang, Fujian, Hubei, Guangxi, Sichuan, Guizhou, and Yunnan.

(1 ♂). Holotype, ♂: “China, Guizhou, Zunyi City, Fenghuang Shan, 800 m, 27°41'N, 106°55'E, 19–VI–2012, Li Run-yu leg. / Holotype ♂, Lobrathium lirunyui, sp. n. Li & Li, det. 2013”.

Large species, body length 9.40 mm, length of fore body 4.20 mm. Habitus as in Fig. 11A. Body reddish brown, legs reddish with pale-reddish tarsi, antennae reddish to brown.

Head longer than wide (HL/HW = 1.06), widest posteriorly; posterior angles weakly marked; punctation of dorsal surface fine and very dense; interstices without microsculpture. Eyes small, approximately one third the length of distance from posterior margin of eye to neck in dorsal view. Antenna long and slender, 2.50 mm long.

Pronotum slender (PL/PW = 1.28, PW/HW = 0.90), lateral margins almost straight and subparallel in dorsal view; punctation similar to that of head, but with impunctate midline.

Elytra longer than wide (EL/EW = 1.02, EW/PW = 1.25, EL/PL = 1.08); punctation coarse and dense, arranged in somewhat irregular series; interstices without microsculpture. Hind wings apparently fully developed.

Abdomen distinctly narrower than elytra; punctation fine and dense; posterior margin of tergite VII with palisade fringe.

Male. Sternite VII (Fig. 11D) strongly transverse, and with shallow median impression posteriorly, without modified setae, posterior margin broadly and weakly concave; sternite VIII (Fig. 11E) weakly transverse, with long and extensive postero-median impression, this impression with numerous modified, stout and short black setae, posterior excision rather broad and U-shaped, on either side of this excision with long dark submarginal setae; aedeagus (Figs 11B, C) 1.56 mm long, with asymmetric ventral process of distinctive shape.

Female. Unknown.

The species is named after Runyu Li, collector of the holotype.

This species is readily distinguished from all its congeners by the following character combination: elytra without spot, whole body of brownish coloration; punctation of head fine and dense, eyes very small, one third as long as distance from posterior margin of eye to neck, male sexual characters highly distinctive.

The holotype was sifted in fern vegetation near a wet tree root (Fig. 20D) in the Fenghuang Shan, Guizhou (Fig. 19).

(7 ♂♂, 3 ♀♀). Holotype, ♂: “China, Guangxi, Shangsi County, Shiwanda Shan, Forest Park, 300–500 m, 21°54'N, 107°54'E, 25–IV–2011, Peng Zhong & Zhu Jian-qing leg. / Holotype ♂, Lobrathium pengi, sp. n. Li & Li, det. 2013”. Paratypes, 6 ♂♂, 3♀♀: same data as holotype.

Body length 6.34–7.34 mm, length of fore body 3.11–3.73 mm. Habitus as in Fig. 12A. Coloration: body black, elytra in posterior 1/3–2/5 with subcircular yellowish spot reaching posterior, but not lateral margins; legs yellowish with forelegs brown to blackish, femora and protibiae and tarsi paler; antennae brown.

Head weakly transverse (HW/HL = 1.02–1.03); posterior angles not marked; punctation coarse and dense, sparser in median dorsal portion, interstices without microsculpture. Eyes large, more than half as long as the distance from posterior margin of eye to neck. Antenna slender, 1.68–1.82 mm long.

Pronotum nearly as wide as head (PL/PW = 1.13–1.33, PW/HW = 0.97–0.98), lateral margins weakly convex in dorsal view; punctation dense and coarse, similar to that of head, but with impunctate midline; interstices without microsculpture and glossy.

Elytra broader than pronotum (EL/EW = 1.0–1.06, EW/PW = 1.35–1.40, EL/PL = 0.98–1.12); humeral angles marked; punctation coarse and dense. Hind wings fully developed.

Abdomen distinctly narrower than elytra; punctation fine and dense; posterior margin of tergite VII with palisade fringe; tergite VIII (Fig. 12F) without appreciable sexual dimorphism, with weakly convex posterior margin.

Male. Sternite VII (Fig. 12D) strongly transverse, posterior impression of triangular shape and impunctate, posterior margin broadly and concave; sternite VIII (Fig. 12E) weakly transverse, without modified setae, posterior excision deep and rather narrow, on either side of this excision with long dark setae; aedeagus (Fig. 12B, C) approximately 1.0 mm long, ventral process of very distinctive morphology, slender and furcate apically, bifurcation forming an angle of more than 30 degrees in lateral view.

Female. Sternite VIII as in Fig. 12G; tergites IX-X (Fig. 6H) relatively short; tergite IX undivided anteriorly, anterior martin emarginated in the middle; tergite X of subovoid shape.

The species is named after Zhong Peng, collector of the type specimens.

This species is similar to Lobrathium diaoluoense, from which it is separated by the broader and apically more abruptly narrowed ventral process of the aedeagus, with the apical bifurcation forming an angle of more than 30 degrees in lateral view.

The specimens were sifted from wet moss along a streamside (Fig. 20E) in the Shiwanda Shan, Guangxi (Fig. 19), in April.

(3 ♂♂). Holotype, ♂: “China, Hubei, Wufeng County, Houhe National Reserve, 1100 m, 30°04'N, 110°37'E, 30–IV–2004, Li Li-zhen leg. / Holotype ♂, Lobrathium quyuani, sp. n. Li & Li, det. 2013”. Paratypes, 2 ♂♂: same data as holotype.

Body length 5.78–6.34 mm, length of fore body 3.28–3.56 mm. Habitus as in Fig. 13A. Coloration: body black with bluish hue, elytra with yellowish to reddish spot reaching posterior but not lateral margins; legs blackish with dark-brownish tarsi; antennae dark-brownish.

Head as wide as long (HW/HL = 0.96–1.03), widest at eyes; posterior angles broadly rounded; punctation dense and moderately coarse, sparser in median dorsal portion; interstices without microsculpture. Eyes large, more than half as long as the distance from posterior margin of eye to neck in dorsal view. Antenna slender, 1.72–1.95 mm long.

Pronotum slender (PL/PW = 1.25–1.41, PW/HW= 0.92–1.0), lateral margins weakly convex in dorsal view, with impunctate midline, punctation similar to that of head, but distinctly sparser, interstices glossy.

Elytra longer than broad (EL/EW = 1.0–1.02, EW/PW = 1.24–1.33, EL/PL = 1.0–1.05); punctation coarse and dense, arranged in irregular series; interstices without microsculpture. Hind wings fully developed.

Abdomen narrower than elytra; punctation fine and dense; posterior margin of tergite VII with palisade fringe; posterior margin of tergite VIII strongly convex in the middle.

Male. Sternite VII (Fig. 13D) strongly transverse, posteriorly with pronounced median impression, this impression of somewhat triangular shape, without punctation and pubescence, posterior margin broadly and very weakly concave; sternite VIII (Fig. 3E) weakly transverse, postero-median impression with modified, stout and short black setae, posterior excision deep and moderately broad, on either side of this excision with long dark submarginal setae; aedeagus (Figs 13B, C) 1.36 mm long, with weakly asymmetric and apically acute ventral process.

Female. Unknown.

The specific epithet refers to the famous late poet Yuan Qu, who was born in Yichang (Hubei), which is near the type locality.

This species is similar to Lobrathium configens Assing (2012) and Lobrathium spathulatum Assing (2012) in external characters. It is distinguished from both by the broader ventral process in ventral view.

The specimens were sifted from wet moss near a stream (Fig. 20C) in the Houhe National Reserve, Hubei (Fig. 19).

(2 ♂♂, 2 ♀♀). China, Zhejiang: 1 ♂, 1 ♀, Anji County, Longwang Shan, Pingxi, 1000–1100 m, 09–VI–2012, Hu & Yin leg.; 1 ♂, 1 ♀, Qingliangfeng, 1050–1070 m, 09–V–2005, Zhu & Li leg.

Widespread, recorded from Hubei, Shanxi, Zhejiang, Sichuan, and Shaanxi.

(1 ♂). China, Shanxi: 1 ♂, Ningwu County, Ximafang, 1430m, 38°39'N, 112°01'E, 04–IX–2011, Peng leg.

Beijing, Hubei, Shanxi.

(6 ♂♂, 3 ♀♀). China, Shaanxi: 1 ♂, Taibai Shan, 1450–1750 m, 34°03'N, 107°53'E – 33°53'N, 107°48'E, 15–VII–2004, Hu & Tang leg.; 3 ♂♂, 2 ♀♀, Zhouzhi County, Houzhenzi, Qinling Shan, West Sangongli Valley, 33°50'N, 107°48'E, 17~19–V–2008, Huang & Xu leg. Guizhou: 1 ♂, Suiyang County, Kuankuoshui N. R., Baishaogou, 700 m, 28°10'N, 107°16'E, 03–VI–2010, Lu et al. leg. Sichuan: 1 ♂, 1♀, Shimian County, Liziping, 1800 m, 28°59'N, 102°28'E, 16–VII–2012, Dai et al. leg.

Sichuan, Shaanxi, Hubei, Guizhou.

(3 ♂♂, 1♀). China, Zhejiang: 1 ♂, Qingliangfeng, 1080 m, 08–V–2005, Zhu & Li leg.; 1 ♂, 1 ♀, Longquan City, Fengyang Shan, 1450–1600 m, 22–VII–2006, Shen & Li leg.; 1 ♂, Baishanzu N.R., 1200–1360 m, 05–V–2004, Hu et al. leg.

The original description of Lobrathium tortuosum is based on specimens from the Fengyang Shan, Zhejiang (Li et al., 2013). The above records from Qingliangfeng extend the distributional range about 200 km northwards. The known distribution is confined to the Tianmu Shan and the Donggong Shan in Zhejiang.

(1 ♂). Holotype, ♂: “China, Qinghai, Xining City, Huzhu County, Beishan National Reserve, 2450 m, 36°56'N, 102°27'E, 28–VII–2004, Tang Liang, Hu Jia-yao & Zhu Li-long leg. / Holotype ♂, Lobrathium uncinatum, sp. n., Li & Li, det. 2013”.

Body length 5.94 mm, length of fore body 3.16 mm. Habitus as in Fig. 18A. Coloration: body black, elytra posteriorly with large yellowish spot reaching posterior and lateral margins; legs reddish with paler tarsi; antennae reddish.

Head transverse (HW/HL = 1.14); posterior angles not marked; punctation coarse and dense, sparser in median dorsal portion, interstices without microsculpture. Eyes large, more than half as long as distance from posterior margin of eye to neck. Antenna slender, 1.92 mm long.

Pronotum moderately oblong, as wide as head (PL/PW = 1.18, PW/HW = 1.0); lateral margins subparallel in dorsal view; punctation dense and coarse, similar to that of head, but with impunctate midline; interstices without microsculpture and glossy.

Elytra longer than broad, broader than pronotum (EL/EW = 1.0, EW/PW = 1.29, EL/PL = 0.98); humeral angles marked; punctation coarse and dense. Hind wings fully developed.

Abdomen narrower than elytra; punctation fine and dense; posterior margin of tergite VII with palisade fringe.

Male. Sternite VI (Fig. 18D) strongly transverse, postero-medially with modified stout black setae; sternite VII (Fig. 18E) strongly transverse, posteriorly with pronounced impression, this impression with numerous modified stout black setae, posterior margin broadly and weakly concave; sternite VIII (Fig. 18F) transverse, postero-median impression with modified setae like on sternites VI and VII, posteriorly with moderately deep excision; aedeagus (Figs 18B, C) with ventral process of distinctive morphology, near middle with distinct dorsal projection in lateral view.

Female. Unknown.

The specific epithet (Latin, hooked) refers to the shape of the ventral process of the aedeagus.

This species can be separated from the externally similar Lobrathium taureum Assing (2012) and Lobrathium schuelkei Assing (2012) by the presence of modified setae on the male sternites VI and VII (Figs 18D, E) and by the distinctive shape of the ventral process of the aedeagus.

The holotype was sifted from wet moss alongside a river bank (Fig. 20F) in the Meda National Reserve, Qinghai (Fig. 19).