Stenus qingliangfengus Tang & Jiang 2018, sp. n.

Stenus qingliangfengus Tang & Jiang, sp. n.

(Figs. 1, 2, 7–12)

Type material. Holotype. China: Zhejiang: ♂, glued on a card with labels as follows: “China: Zhejiang Province, Lin’an City, Qingliangfeng Natural Reserve, alt. 800–1000m, mixed forest leaf litter, sifted, 20.VII.2009, Feng, Yuan & Yin leg.” “Holotype / Stenus qingliangfengus / Tang & Jiang” [red handwritten label] (SHNU). Paratypes. 9♂♂ 6♀♀, same data as for the holotype (SHNU, cPut).

Description. Brachypterous. Head black with clypeus and labrum reddish brown, pronotum reddish brown, elytra light reddish brown, abdomen reddish brown with apical half of segment VI and last four segments darker or abdomen uniformly brownish. Antennae yellowish brown with club infuscate, maxillary palpi and legs yellowish brown.

BL: 2.5–2.9 mm, FL: 1.4 mm. HW: 0.62–0.70 mm, PL: 0.48–0.52 mm, PW: 0.47–0.50 mm, EL: 0.47–0.50 mm, EW: 0.54–0.59 mm, SL: 0.33–0.38 mm.

Head 1.11–1.20 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, reaching the level of inner eye margins; punctures round, mostly well delimited, slightly confluent on median portion, similar in size except few larger punctures near the midline of meian portion, diameter of most punctures slightly narrower than apical cross section of antennal segment II; interstices reticulated, distinctly narrower than to as wide as half the diameter of punctures except those along the midline of the posterior half of the median portion, which may be as wide as twice the diameter of punctures. Paraglossa oval.

Pronotum 1.01–1.05 times as long as wide; disk slightly uneven, with broad median longitudinal furrow; punctures on median longitudinal furrow mostely well deimited and distinctly smaller than those of head, punctures on the rest portions of pronotum mostly confluent, different in size, a little larger to smaller than those of head; interstices reticulated and more or less rugae-like, mostly narrower than half the diameter of punctures except those at the actual middle of longitudinal furrow, which may be as wide as triple the diameter of punctures.

Elytra 0.84–0.87 times as long as wide; disk relatively even, with humeral impression more or less distinct; punctures and interstices similar to those of pronotum except the reticulation indistinct.

Legs with tarsomeres IV deeply bilobed.

Abdomen cylindrical; abdominal segment III with tergites and sternites entirely fused, though indistinct traces of paratergites can be observed on basal half, segments IV–VI with tergites and sternites fused, tergite VII without apical membranous fringe; punctures round to elliptic, becoming slightly smaller posteriad; interstices reticulated, narrower than half the diameter of punctures on tergite III and IV.

Male. Sternite VII with posteriomedian portion flattened, posterior margin of flattened portion slightly emarginated; sternite VIII (Fig. 7) roundly emarginated at middle of posterior margin; sternite IX (Fig. 8) with long apicolateral projections, posterior margin serrate and almost straight. Aedeagus (Figs. 9, 10) stout; apical sclerotized area of median lobe very short; expulsion clasps large, strongly sclerotized and conjointed; parameres much longer than median lobe, swollen at apical parts, each with 19–24 setae on apico-internal margins.

Female. Sternite VIII (Fig. 11) prominent at middle of posterior margin; spermatheca (Fig. 12) with basal porch strongly sclerotized, spermathecal duct sclerotized and bent twice.

Distribution. China (Zhejiang).

Remarks. The species resembles S. micuba Hromádka, 1982 from Jiangsu, S. hlavaci Puthz, 2003 from Jiangxi, S. breviculus Tang, Li & Puthz, 2010 from Zhejiang, S. pseudomicuba Tang, Puthz & Yue, 2016 from Zhejiang, but can be distinguished from S. micuba, S. breviculus, S. pseudomicuba by the larger body size, from S. hlavaci by longer pronotum (in S. hlavaci, pronotum as long as wide).

Etymology. The specific name is derived from “Qingliangfeng”, the type locality of this species.