(Figs 5, 12G–I, 13A)

Type locality. China, Guizhou, Libo Xian, Yuping Zhen, Shuipu Cun, Shuiboshui Dong.

Type material. HOLOTYPE: J, ‘ Shuiboshui Dong cave, Shuipucun, Yuping Zhan, Libo Xian, Guizhou / [Guizhou, CHINA] {locality repeated in Chinese character}, 25.ix.1998, S. Uéno leg.’ (NSMT). PARATYPES: 2 ♀♀, same label data as holotype (NSMT); 4 JJ 12 ♀ ♀, same label data, except ‘T. Kishimoto leg. (NSMT); 1 J, same label data, except ‘ 13.ix.1997, Fuxing Wang leg (NSMT)’; 3JJ 7♀♀, also at Shuipucun, except ‘ Shuijiang Dong cave (520 m) {locality repeated in Chinese character}, 25.ix.1998, Toshio Kishimoto leg.’ (NSMT); 1 ♀, same label data, except ‘S. Uéno leg.’ (NSMT); 3 JJ 3 ♀♀, same label data, except ’ 29.x.2000, T. Kishimoto lg.’ (NSMT).

Diagnosis. Male: vertex simple, lacking modification; antennomeres VIII–XI modified; each eye composed of about 50 facets; pronotum with small lateral spines; metaventrite raised above metacoxae to form ridges, with a row of dense setae along each ridge; aedeagus with apical portion of the median lobe split to two parts, dorsal part shorter than ventral part. Female: Each eye with about 8 facets; may be identified by the association with male.

Description. Male. Body (Fig. 5A) reddish brown, mouth parts, antennae and tarsi paler; BL 2.84–2.97 mm. HL 0.61–0.63 mm, HW 0.58–0.59 mm; median longitudinal carina extending from base to level of eyes; each eye composed of about 50 facets; antennomeres VIII–IX modified (Fig. 5B). Pronotum about as long as wide, PL 0.61–0.62 mm, PW 0.60–0.61 mm; with small discal and lateral spines. Elytra slightly wider than long, EL 0.87–0.88 mm, EW 0.94– 0.91 mm; discal striae extending to apical 2/3 elytral length. Metaventrite (Fig. 5C) strongly raised above metacoxae, with pair of rows of dense setae; metacoxae and metatrochanters simple. Abdomen narrower than elytra, AL 0.75–0.84 mm, AW 0.79–0.81 mm. Aedeagus (Figs 5D, E) asymmetric, length 0.62 mm.

Female. Similar to male in general; each eye with about 8 facets; antennae and metaventrite simple. Tergite VIII (Fig. 12G) and sternite VIII (Fig. 12H) transverse; width of genital complex excluding lateral arms (Fig. 12I) 0.17 mm. Measurements: BL 2.75–2.76 mm; HL 0.61–0.63 mm, HW 0.57–0.58 mm, PL 0.61–0.62 mm, PW 0.59–0.60 mm, EL 0.83–0.84 mm, EW 0.88–0.90 mm, AL 0.68–0.69 mm, AW 0.83–0.85 mm.

Etymology. The new species is named after the distinct rows of setae on metaventrite; adjective.

Distribution. Southwest China: Guizhou (Fig. 13A).