(Figs 2, 13A)

Type locality. China, Guizhou, Libo Xian, Wengang X., Liangzhaixin, Bonong Dong.

Type material. HOLOTYPE: J, ‘ Bonong Dong Cave (740 m), Liangzhaixin, Wengang X., Libo Xian, [Guizhou, CHINA] / {locality repeated in Chinese character} 31.x.2000, T. Kishimoto lg.’ (NSMT).

Diagnosis. Male: vertex modified, covered with patches of dense setae; antennomeres VIII–XI simple; each eye composed of about 25 facets; pronotum lacking lateral spines; metaventrite raised above metacoxae to form ridges, setae mostly dense at posterior portion of the ridges; aedeagus with apical portion of the median lobe not split to two parts.

Description. Male. Body (Fig. 2A) reddish brown, mouth parts, antennae and tarsi paler; BL 2.93 mm. HL 0.58 mm, HW 0.59 mm; median longitudinal carina extending from base to level of eyes; each eye composed of about 25 facets; antennomeres VIII–IX simple (Fig. 2B). Pronotum about as long as wide, PL 0.62 mm, PW 0.60 mm; lacking discal and lateral spines. Elytra slightly wider than long, EL 0.84 mm, EW 0.89 mm; discal striae short, extending through 1/3 of elytral length. Metaventrite (Fig. 2C) raised above metacoxae, with longitudinal carinae covered with dense setae; metacoxae and metatrochanters simple. Abdomen narrower than elytra, AL 0.89 mm, AW 0.82 mm. Aedeagus (Figs 2D, E) asymmetric, length 0.56 mm. Female. Unknown.

Etymology. The species epithet refers to the simple male antennae, a unique feature within the group; adjective.

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