Stenus huapingensis Tang, Li & Huang

Tang, Liang, Li, Li-Zhen & Wang, Jun-Wang, 2012, Two additional new species of the Stenus indubius group (Coleoptera, Staphylinidae) from China, ZooKeys 215, pp. 41-54 : 42-44

Stenus huapingensis Tang, Li & Huang sp. n. Figs 1, 5

Type material.

Holotype ♂:"China: Guangxi Prov., Lingui County, Huaping N. R., Anjiangping, 1500m, 18.VII.2011, TANG Liang Leg." "Holotype / Stenus huapingensis / Tang & Li" [red handwritten label] (SHNU). Paratypes. 5♂♂, 12♀♀, same locality but 1400-1700 m, 14-18 VII.2011, L. Tang, W.-J. He, Z. Peng, Y. Chen & W.-L. Ma leg. (1 pair in cPut, remainder in SHNU).

Description.

Brachypterous; body blackish, anterior margin of labrum brownish, antennae, maxillary palpi and legs yellowish brown, each elytron with an oval orange spot near lateral side, which is about 1/3 as long as and 1/3 as broad as the respective elytron.

BL: 4.1-4.9 mm; FL: 2.1-2.3 mm.

HW: 0.84-1.02 mm, PL: 0.71-0.82 mm, PW: 0.62-0.72 mm, EL: 0.73-0.88 mm, EW: 0.71-0.89 mm, SL: 0.57-0.65 mm.

Head 1.12-1.18 times as wide as elytra; interocular area with deep longitudinal furrows, median portion convex, extending to the level of inner eye margins; punctures round, well delimited in median portion and more or less confluent into diagonal stria in furrows, slightly larger and sparser in median area than near inner margins of eyes, diameter of large punctures about as wide as apical cross section of antennal segment II; interstices partially with faint reticulation, smaller than half the diameter of punctures except those in median portion and behind basi-antennal tubercles, which may be much larger. Antennae, when reflexed, extending a little beyond posterior margin of pronotum; relative length of antennal segments from base to apex as 11: 8: 19: 11.5: 10: 9.5: 9.5: 6.5: 7: 8: 8.5. Paraglossa oval.

Pronotum 1.11-1.15 times as long as wide; disc with distinct median longitudinal furrow, two indistinct impressions in anterior half, indistinct transverse impression in the middle, and two indistinct impressions in posterior half; punctures moderately rugose and confluent, a little larger than those of head; interstices partially indistinctly reticulated, mostly smaller than half the diameter of punctures except those at the bottom of median longitudinal furrow, which may be distinctly larger.

Elytra 0.94-1.03 times as long as wide, lateral margins with slight concavity before the middle; disc slightly uneven with shallow longitudinal humeral impression, shallow postero-lateral impression, and distinct sutural impression; suture moderately convex; punctation and interstices similar to those of pronotum.

Hind tarsi 0.73 times as long as hind tibiae, tarsomeres IV distinctly bilobed.

Abdomen cylindrical; distinct paratergites absent, but rudimentary lateral border present; tergite VII with palisade fringe; punctures on abdominal tergites III–VIII round to elliptic, gradually becoming smaller posteriad; interstices smaller to little larger than half the diameter of punctures, with relatively faint reticulation on all abdominal tergites.

Male. Sternite VII with posteromedian portion slightly flattened; sternite VIII (Fig. 5A) with shallow emargination at middle of posterior margin; sternite IX (Fig. 5B) with very long apico-lateral projections, posterior margin serrate; tergite X (Fig. 5C) with posterior margin slightly emarginated. Aedeagus (Figs. 5D, 5E) with setae at sclerotized apex of median lobe; expulsion hooks (Fig. 5G) large; parameres extending beyond apex of median lobe, bisinuate, with about 13 setae on inner side (Fig. 5F).

Female. Abdomen broader than in male; sternite VIII (Fig. 5H) slightly prominent at the middle of posterior margin; tergite X (Fig. 5I) slightly emarginated at posterior margin; sclerotized spermatheca as in Figs 5J, 5K.

Distribution.

China (Guangxi Province: Huaping Nature Reserve).

Biological notes.

All the specimens were collected by shifting the mixture of bamboo leaves and broad tree leaves in dense forest.

Diagnoses.

In general facies, the new species resembles Stenus zhaiyanbini Tang & Li, 2012, but it may be distinguished by sparser and larger punctation of head, generally smaller elytral spots and the different sexual characters.

Etymology.

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