Dianous fengtingae 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 : 70-72

Dianous fengtingae Tang et Li sp. n. Figs 3, 427-35

Type material.

Holotype. China: Hainan: male, glued on a card with labels as follows: "China: Hainan Prov., Ledong County, Jianfengling N. R., alt. 900m, 16.IV.2010, Feng & Yuan leg." "Holotype / Dianous fengtingae / Tang & Li" [red handwritten label] (SHNU). Paratypes. male and 4 females, same data as for the holotype. (SHNU); female, Changjiang County, Bawangling, alt. 1000m, 14.XI.2006, Li Li-Zhen leg. (SHNU); 4 females, Changjiang County, Bawangling, alt. 450-650m, 13.IV.2010, Zhu Jian-Qing leg. (female in cPut, female in cRou, rest in SHNU).

Description.

Body entirely black, head, pronotum, elytra and basal abdominal tergites with a blue metallic lustre. Antennae blackish brown, with club segments lighter. First two segments of maxillary palpi brownish yellow, last segment brown. Legs blackish with tibiae and tarsi slightly lighter, femora yellowish in basal third.

BL: 4.5-4.9mm; FL: 2.5-2.6 mm.

Proportions of holotype: HW: 63.5, PW: 47, PL: 53, EW: 61, EL: 67.

Head 1.04 times as wide as elytra; interocular area gently inclined inward forming a shallow and broad concavity; punctures round, distinctly delimited, slightly larger on median area than near dorsal margins of eyes, diameter of large punctures about as wide as widest cross section of 2nd antennal segment, interstices smooth, mostly smaller than half diameter of punctures. Antennae when reflexed exceeding posterior margin of pronotum; length of segments from base to apex: 10.0: 7.0: 17.5: 11.0: 9.0: 8.0: 8.0: 7.0: 7.0: 8.0: 10.0.

Pronotum 1.28 times as long as wide, widest slightly before middle and constricted at base; punctures round, partially slightly confluent, distinctly larger than those on frons, interstices smooth, mostly smaller than half diameter of punctures.

Elytra nearly rectangular; punctation on average slightly coarser than that of pronotum, punctures on humeral area mostly distinctly delimited, and those on inner 2/3 portion of elytra (especially those on posterior half) obliquely confluent, interstices similar to those on pronotum.

Length of metatarsi from base to apex: 11.5: 8.5: 5.5: 3.5: 10.5.

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

Male. Seventh sternite (Fig. 29) with a distinct posteriomedian emargination, 8th sternite (Fig. 30) with a broad triangular emargination posteromedially; 9th sternite (Fig. 31) with the apicolateral portion serrate, posterior margin slightly emarginate; 10th tergite (Fig. 32) with the posterior margin broadly rounded. Median lobe of aedeagus (Fig. 18) with an acutely pointed and setose apex (Fig. 19), parameres extending far beyond the apex of median lobe.

Female. Sternite 8 (Fig. 33) pointed posteromedially; valvifer (Fig. 34) with the posterior margin serrate; 10th tergite (Fig. 35) with the posterior margin truncate.

Distribution.

China (Hainan).

Diagnosis.

The new species is similar to Dianous tonkinensis (Puthz, 1968) from South Asia and Dianous lividus (L. Benick, 1929) from Philippines and Indonesia. It may be distinguished from both by the coarser and less confluent punctation on pronotum and especially on elytra.