Olophrinus setiventris Chang, Yin & Li, sp. nov.

(Figs 8B, 9–10, 18)

Type material. HOLOTYPE: ♁, CHINA: YUNNAN: ‘ China: Yunnan Prov., Nabanhe N. R., Hui-lao-xin-zhai (OiZǛḃ), Lao-yin-shui-chi (Zửķ ±), alt. 1250 m, 04.v.2009, J.-Y. Hu & Z.-W. Yin leg.’ (SNUC).

Diagnostic description. Male. Habitus as in Fig. 8B. Body slightly convex, TBL 7.01 mm, FBL 4.21 mm; head, pronotal disc and abdomen black, elytra and most parts of legs reddish-brown. Head (Figs 9A, 9B) sub-triangular, HL 0.92 mm, HW 1.05 mm, with fine punctures, posterolateral and posterior margins with microsculpture consisting of transverse waves; eyes prominent, EyL 0.31 mm; antennae broken. Pronotum (Fig. 9C) strongly transverse, PL 1.37 mm, PW 2.59 mm, PL/PW 0.53, with fine punctures, lacking microsculpture. Elytra (Figs 9D, 9E) transverse, EL 1.74 mm, EW 2.59 mm, EL/EW 0.67, each elytron with seven complete rows of punctures. Abdominal (Fig. 9F) surface with coarse punctures, and microsculpture consisting of transverse waves; tergite VIII (Fig. 10A) with six relatively short lobes, narrowly and shallowly incised between inner lobes and outer ones; tergite IX (Fig. 10B) divided laterally to four lobes; sternite VI (Figs 10 C–E) with posterior margin narrowly and shallowly emarginate, dense and elongate pubescence arranged along emargination; sternite VII (Figs 10 F–G) with posterior margin deeply and broadly emarginate, peg setae evenly arranged along posterior margin; sternite VIII (Fig. 10H) with four lobes, shallowly incised between inner and outer lobes, mid-length 1.52 times as long as depth of incision; sternite IX elongate and asymmetric (Fig. 10I). Length of aedeagus (Figs 10 J–K) 2.04 mm, parameres short, slightly asymmetric, right paramere longer than left one in ventral view, median lobe broad at base and narrowing toward apex.

Female. Unknown.

Comparative notes. Olophrinus setiventris is similar to O. lantschangensis in sharing the head with fine punctures, the posterolateral and posterior margins of the head with microsculpture consisting of transverse waves, and each elytron with seven complete rows of punctures. The new species can be readily separated by the densely setose emargination of the posterior margin of male sternite VI.

Distribution. China: Yunnan (Fig. 18).

Etymology. The specific epithet is a noun combined from Latin ‘ seti- ’ (seta, bristle) and ‘ ventris ’ (venter), referring to the setose posterior margin of male sternite VI.