Lobrathium dufui Li & Li

Li, Wen-Rong, Zhao, Mei-Jun, Dai, Cong-Chao & Li, Li-Zhen, 2013, New species and records of Lobrathium Mulsant & Rey (Coleoptera, Staphylinidae, Paederinae) from China, ZooKeys 304, pp. 49-81 : 62-64

Lobrathium dufui Li & Li sp.n. Figs 8

Type material

(1 ♂, 2 ♀♀). Holotype, ♂: "China, Hubei, Wufeng County, Houhe National Reserve, 30 –IV– 2004, 1100 m, 30°04'N, 110°37'E, Li Li-zhen leg. / Holotype ♂, Lobrathium dufui , sp. n. Li & Li, det. 2013". Paratypes, 2 ♀♀: same data as holotype.

Description.

Body length 5.84-6.89 mm, length of fore body 3.34-3.61 mm. Habitus as in Fig. 8A. Coloration: body black, posterior portion of elytra with oblong yellowish spot of at least 2/5 the length of elytra and reaching posterior margins and lateral margins; legs blackish with slightly paler tibiae and tarsi; antennae brown.

Head weakly transverse (HW/HL = 1.02-1.09), widest at eyes, weakly tapering behind eyes; posterior angles rounded, not marked; punctation coarse and moderately dense, sparser in median dorsal portion and on frons; interstices without microsculpture. Eyes large, more than half the length of postocular region from posterior margin of eyes to neck in dorsal view. Antenna slender, 1.72-2.18 mm long.

Pronotum approximately as wide as head (PL/PW = 1.25-1.31, PW/HW = 0.96-1.10); lateral margins weakly convex in dorsal view; punctation dense and coarse, similar to that of head, but with impunctate midline; interstices without microsculpture and glossy.

Elytra broader than pronotum (EL/EW = 1.02-1.06, EW/PW = 1.21-1.39, EL/PL = 1.01-1.08); humeral angles marked; punctation coarse and dense. Hind wings apparently present.

Abdomen distinctly narrower than elytra; punctation fine and dense; posterior margin of tergite VII with palisade fringe; tergite VIII (Fig. 8F) without appreciable sexual dimorphism, posterior margin broadly convex.

Male. sternite VII (Fig. 8D) transverse and posteriorly with pronounced impression of triangular shape, this impression impunctate in the middle and laterally with a few modified, stout and short black setae, posterior margin broadly and weakly concave; sternite VIII (Fig. 8E) weakly transverse, with deep and broad, U-shaped posterior excision, median impression furnished with numerous modified, stout, short and black setae; aedeagus (Figs 8B, C) with ventral process of very distinctive morphology, apically with fissure and bifid.

Female. Sternite VIII (Fig. 8G) weakly transverse, posteriorly convex; tergite IX (Fig. 8H) undivided anteriorly, anterior margin emarginated in the middle; tergite X of subovoid shape.

Etymology.

The species is named after the famous late poet Fu Du, who was born in Hubei.

Comparative notes.

This species is similar to Lobrathium uncinatum Li & Li sp. n. (described below) in external characters, and to Lobrathium hebeatum Zheng (1988) in sexual characters. It differs from Lobrathium uncinatum by the shape of the aedeagus and by the absence of modified setae on the male sternite VI, and from Lobrathium hebeatum by the shape of the apex of the ventral process of the aedeagus.

Habitat and distribution.

The type specimens were sifted from wet moss near a stream (Fig. 20C) in Hubei (Fig. 19).