Stenus jinxiuensis Liu and Tang

Liu, Sheng-Nan & Tang, Liang, 2017, Seven new species of the Stenus cirrus group (Coleoptera, Staphylinidae) from Guangxi, South China, Zootaxa 4268 (2), pp. 238-254 : 245-246

Stenus jinxiuensis Liu and Tang , new species

( Figs 9, 10 , 49–53 )

Type material. CHINA: Guangxi: Holotype: ♂, Jinxiu County, alt. 1200–1400m. 27.VII.2011, PENG Zhong leg. ( SHNU).

Description. Brachypterous; body dark brown except head blackish, each elytron with a large elongate yellow spot near lateral margin, which is about 2/3 as long as and 1/2 as broad as the respective elytron. Antennae, maxillary palpi and legs yellowish except antennal club infuscate. Labrum reddish brown.

BL: 3.3 mm, FL: 1.6 mm.

HW: 0.71 mm, PL: 0.51 mm, PW: 0.50 mm, EL: 0.54 mm, EW: 0.59 mm, SL: 0.44 mm.

Head 1.20 times as wide as elytra; interocular area with two deep longitudinal

furrows, median portion convex, slightly extending beyond the level of inner eye margins, with a broad impunctate line along midline; punctures round, mostly well defined, slightly larger and sparser in median portion than near inner margins of eyes, diameter of large punctures about as wide as apical cross section of antennal segment II; interstices smooth, narrower than half to entire diameter of punctures except those along the midline of the convex median portion, which may be twice as wide as diameter of punctures. Paraglossae oval.

Pronotum 1.02 times as long as wide; disk relatively even, without distinct median longitudinal furrow; punctures round and more or less confluent, larger in size than those of head; interstices smooth, much narrower than half the diameter of punctures except for those at the actual middle of the pronotum, which could be slightly larger.

Elytra 0.92 times as long as wide, disk relatively uneven, each with distinct humeral impression; punctures round and confluent, similar size of those on pronotum; interstices smooth, distinctly narrower than half the diameter of punctures.

Legs with tarsomeres IV strongly bilobed.

Abdomen cylindrical; paratergites very narrow and almost impunctate, present only in segment III, tergites and sternites totally fused in segments IV–VI, posterior margin of tergite VII with indistinct palisade fringe; punctures round, gradually becoming smaller and sparser posteriad; interstices smooth, varying from narrower to much wider than diameter of punctures.

Male. Sternite VIII ( Fig. 49 ) with shallow emargination at middle of posterior margin; sternite IX ( Fig. 51 ) with long and straight apicolateral projections, posterior margin serrate; tergite X ( Fig. 50 ) with posterior margin convex. Aedeagus ( Fig. 52 ) with apical sclerotized area subtriangular and roundly projected at apex; expulsion clasps large; parameres distinctly longer than median lobe, each with 9 setae on apico-internal margins.

Female. Unknown.

Distribution. China (Guangxi).

Remarks. The new species can be distinguished from other species by the combination of the following characters: body size smaller, the convex median portion of head with a broad impunctate midline throughout, each elytra with spot and different sexual characters.

Etymology. The specific name is derived from the type locality of this species.

Figures

FIGURES 9 – 10. Dorsal habitus of Stenus jinxiuensis sp. n. Scale bars: 1 mm.

FIGURES 49 – 53. Diagnostic features of Stenus jinxiuensis. 49. Male sternite VIII. 50. Male tergites IX – X. 51. Male sternite IX. 52 – 53. Aedeagus, in dorsal view. Scale bars: 0.25 mm.