Stenus xilingmontis, Tang, Liang, Liu, Si-Yu & Niu, Tong, 2016

Tang, Liang, Liu, Si-Yu & Niu, Tong, 2016, A revision of the Stenusflammeus group (Coleoptera, Staphylinidae) with descriptions of twelve new species, ZooKeys 595, pp. 57-83 : 72-75

Taxon classification Animalia Coleoptera Staphylinidae

Stenus xilingmontis sp. n. Figs 8, 53-57

Type material.

Holotype. China: Sichuan: ♂, glued on a card with labels as follows: "China: Sichuan, Xiling Mt., 1300 m, litter, 30.VII.1996, S. Kurbatov leg." "Holotype / Stenus xilingmontis / Tang, Liu & Niu" [red handwritten label] (MHNG). Paratypes. 2♂♂8♀♀, same data as for the holotype (1pair in SHNU, rest in MHNG).

Description.

Brachypterous; body reddish brown except head broadly blackish along the inner eye margins. Antennae, maxillary palpi and legs yellowish brown except antennal club infuscate.

BL: 3.1-3.7mm, FL: 1.6-1.8 mm.

HW: 0.70-0. 79 mm, PL: 0.53-0.63 mm, PW: 0.55-0.63 mm, EL: 0.58-0.67 mm, EW: 0.65-0.73 mm, SL: 0.47-0.55 mm.

Head 1.06-1.09 times as wide as elytra; interocular area with two deep longitudinal furrows, median portion convex, slightly extending beyond the level of inner eye margins; punctures round, slightly larger and sparser on median area than those near inner margins of eyes, diameter of large punctures about as wide as apical cross section of antennal segment II; interstices smooth, much narrower than half the diameter of punctures except those along the midline of the convex median portion, which may be 1.5 times as wide as diameter of punctures. Paraglossa coniform.

Pronotum 0.95-1.00 times as long as wide; disk uneven, with distinct median longitudinal furrow, two impressions in anterior half, transverse impression in the middle, and two impressions in posterior half; punctures partially confluent, of similar size to those of head; interstices smooth except few reticulations at the bottom of median furrow, more or less narrower than half the diameter of punctures except those at the bottom of longitudinal furrow, which may be twice as wide as diameter of punctures.

Elytra 0.89-0.93 times as long as wide; disk moderately uneven with distinct longitudinal humeral impression, distinct postero-lateral impression and long sutural impression, suture moderately convex; punctation and interstices similar to those of pronotum except punctures slightly confluent longitudinally.

Legs with tarsomeres IV deeply bilobed.

Abdomen cylindrical; paratergites very narrow and punctate, present only in segment III, tergites and sternites totally fused in segment IV–VI, tergite VII without apical membranous fringe; punctures of abdominal tergites III–VIII round, gradually becoming smaller posteriad; interstices smooth except those of last three tergites more or less shallowly reticulated, narrower than half the diameter of to the diameter of punctures.

Male. Sternite VIII (Fig. 53) with semi-circular emargination at middle of posterior margin; sternite IX (Fig. 54) with very long apicolateral projections. Aedeagus (Figs 56, 57) slender, apical sclerotized area triangular; expulsion clasps large; parameres shorter than median lobe, slightly swollen at apex, each with 12-14 setae on apico-internal margins.

Female. Sternite VIII inconspicuously prominent at middle of posterior margin; valvifers as in fig. 55, sclerotized spermatheca undetected.

Distribution.

China (Sichuan).

Remarks.

The new species shares the same appearance with Stenus zhoudeyaoi sp. n., and both of them distributed on the same mountain. Dissections are necessary to distinguish them, though the altitude information will be also helpful.

Etymology.

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