Stenus musicola Cameron, 1930

Shuai, Qi, Tang, Liang & Luo, Yong-Ting, 2020, A review of the Stenus aureolus group of China (Coleoptera: Staphylinidae), Acta Entomologica Musei Nationalis Pragae (Acta. Ent. Mus. Natl. Pragae) 60 (2), pp. 615-627 : 620

Stenus musicola Cameron, 1930

( Figs 3 , 19–21 )

Stenus musicola Cameron, 1930: 339 : PඎඍΗඓ (1976: 11); PඎඍΗඓ (2012:

100). Material examined. NEPAL: 1J, Thorong pass near Muktinath, S. Hang

[south slope], 4500 m, Pa 343, H. Franz leg. ( VPSG). 1 J, ix–x.1971, H. Franz leg.( VPSG); 1 J, Solukhumbu, Distr., Goyom above Sete, 3100 m, 10.v.1997, W. Schawaller leg. ( VPSG). INDIA: HංආൺർΗൺඅ PඋൺൽൾඌΗ: 1 J, Rohtangpass, S. Hang, 2500–3500 m, H. Franz leg. ( VPSG).

Previously published records from China.Yඎඇඇൺඇ: Heishui, N. Lijiang (PඎඍΗඓ 2012); Zhongdian (PඎඍΗඓ 2012); Nujiang,Lishui, Goligongshan, NW Liuku (PඎඍΗඓ 2012). QංඇǤΗൺං: Baiyan (PඎඍΗඓ 2012).

Differential diagnosis. The species can be readily recognized from other species of the group by the combination of the following characters: larger body size with FL = 2.3–2.6 mm, elytra longer with EL/EW = 1.02–1.09, abdominal tergite VII with apical membranous fringe, hind tarsi with segments IV indistinctly emarginated on apical margin; aedeagus with apical sclerotized area of median lobe short and expulsion clasps very large ( Fig. 20 ).

Redescription. Measurements. BL: 4.7–5.3 mm, FL: 2.3–2.6 mm. HW: 0.86–0.87 mm, PL: 0.70–0.71 mm, PW: 0.70–0.74 mm, EL: 0.96–1.11 mm, EW: 0.88–1.09 mm, SL: 0.70–0.93 mm. Head 0.80–0.98 times as wide as elytra; pronotum 0.96–1.01 times as long as wide; elytra 1.02–1.09 times as long as wide.

Male. Mesotibiae and metatibiae each with tooth on inner side of apex; sternite VIII with triangular emargination in middle of posterior margin;sternite IX ( Fig. 21 ) with distinct apicolateral projections, posterior margin serrate.Aedeagus ( Figs 19, 20 ) robust; apical sclerotized area of median lobe short in length and sharply pointed at tip; expulsion clasps very large, strongly sclerotized; copulatory tube long and broad; parameres much longer than median lobe, swollen in apical parts, each with two groups of setae on apico-internal margins: 10–15 setae in distal and 3–5 setae in basal group.

Female. Though a few females were examined and listed in PඎඍΗඓ (1976, 2012), no details of the female characters have been described or illustrated yet.

Distribution. China (Yunnan, Qinghai), Pakistan, India, Nepal, Bhutan.

Figures

Figs 1–5. Habitus. 1 – Stenus aureolus Fauvel, 1875; 2 – S. trigonuroides Zheng, 1993; 3 – S. musicola Cameron, 1930; 4 – S. nigraureolus Ryvkin, 2003; 5 – S. mendaensis sp. nov. Scale bars = 1 mm.

Figs 19–26. Sexual characters. 19–21 – Stenus musicola Cameron, 1930; 22 – S. nigraureolus Ryvkin, 2003; 23–26 – S. mendaensis sp. nov. 19, 20, 23, 24 – aedeagus; 21, 25 – male sternite IX; 22, 26 – spermatheca. Scale bars = 0.25 mm.