Dianous huanghaoi Tang et Li

Tang, Liang, Li, Li-Zhen & Cao, Guang-Hong, 2011, On Chinese species of Dianous group I (Coleoptera, Staphylinidae, Steninae), ZooKeys 111, pp. 67-85 : 75

Dianous huanghaoi Tang et Li sp. n. Figs 11, 1254-62

Type material.

Holotype. China: Yunnan: male, glued on a card with labels as follows:"Zhonghutiao, Hutiaoxia Coun., Yunnan Prov., 24.IV.2005, Huang Hao leg." "Holotype / Dianous Huanghaoi / Tang & Li" [red handwritten label] (SHNU). Paratypes. 2 males and 5 females, same data as for the holotype. (1 pair in cPut; rest in SHNU); 2 females, Yushuizhai, Lijiang, alt. 2600m, 14.IV.2003, stream moss, G. de Rougemont leg. (cRou)

Description.

Body entirely black with a faint plumbeous lustre. Antennae blackish brown, antennal club slightly lighter than preceding segments. Maxillary palpi brownish. Legs black with a brownish tint, tibiae and tarsi slightly lighter.

BL: 4.6-5.0mm; FL: 2.6-2.7mm.

Proportions of holotype: HW: 59.5, PW: 44.0, PL: 50.5, EW: 66.0, EL: 69.5.

Head 0.9 times as wide as elytra; lateral portions of frons slightly raised, median portion concave; punctures round to elliptic, distinctly delimited, slightly larger on median area than near dorsal margins of eyes, diameter of largest punctures about as wide as basal cross section of 2nd antennal segment, interstices smooth, smaller than or as broad as half diameter of punctures. Antennae when reflexed extending to the posterior margin of pronotum; Length of segments from base to apex as 9.5: 6.5: 14.5: 8.5: 7.5: 6.5: 7.0: 5.5: 6.0: 5.5: 8.0.

Pronotum 1.15 times as long as wide, widest slightly before middle and constricted at base; punctures partially confluent, similar in size to those on head, interstices similar to those on frons.

Elytra nearly rectangular; punctation similar to that of the pronotum, punctures on humeral area mostly distinctly delimited, those on posterior half of elytra strongly confluent, forming a narrowly vorticose sculpture.

Relative length of segments of hind legs from base to apex as 15.0: 8.5: 5.5: 3.5: 14.5.

Abdomen subcylindrical; 3rd to 6th segments with broad and densely punctate paratergites, paratergites on 4th segment as broad as largest width of hind tibia; 7th tergite with an apical membranous fringe; punctures on 3rd tergite distinctly smaller than eye facet, interstices smooth.

Male. Seventh sternite (Fig. 56) with a very shallow emargination posteromedially, 8th sternite (Fig. 57) with a broad emargination posteromedially; 9th sternite (Fig. 58) with distinct apicolateral projections, posterior margin finely serrate and almost straight; 10th tergite (Fig. 59) with a shallow emargination at middle of posterior margin. Median lobe of aedeagus (Fig. 54) with a triangularly pointed and setose apex (Fig. 55), parameres extending far beyond the apex of median lobe.

Female. Eighth sternite (Fig. 60) with posterior margin hardly pointed at middle; valvifer (Fig. 61) with posterior margin serrate; 10th tergite (Fig. 62) with the posterior margin rounded.

Distribution.

China (Yunnan).

Diagnosis.

The new species is similar to Dianous carinipennis ( Bernhauer, 1914) and Dianous nilgiriensis Puthz, 1995, both from India. It can be distinguished from the latter two species by the less confluent punctation on pronotum and with vorticose sculpture on posterior half of elytra.