Stenus musicola Cameron, 1930

Stenus musicola Cameron, 1930 View in CoL

( Figs 3 View Figs 1–5 , 19–21 View Figs 19–26 )

Stenus musicola Cameron, 1930: 339 View in CoL : 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 View Figs 19–26 ).

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 View Figs 19–26 ) with distinct apicolateral projections, posterior margin serrate.Aedeagus ( Figs 19, 20 View Figs 19–26 ) 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.