Hybos xii, Li, Zhu, Wang, Ning & Yang, Ding, 2014

Li, Zhu, Wang, Ning & Yang, Ding, 2014, New species of Hybos Meigen from Northwest China (Diptera: Empidoidea, Hybotinae), Zootaxa 3786 (2), pp. 166-180 : 177-179

17. Hybos xii sp. nov.

( Figs 17–20 )

Diagnosis. First flagellomere with 1 dorsal setula; arista bare. Wing hyaline, slightly tinged brownish, R4+5 and M1 weakly divergent apically. Legs nearly entirely black. Hind femur distinctly thickened, with three rows of ventral spines. Right surstylus apically wide and rounded with short spinose marginal setae and a nearly finger-like inner process. Hypandrium basally wide, apically acute.

Description. Male. Body length 5.2–5.8 mm, wing length 5.4–5.8 mm.

Head black with pale gray pollinosity. Eyes brownish yellow with slightly enlarged upper facets dark yellow. Setulae and setae on head black except postero-ventral surface with mostly dark yellow setulae; ocellar tubercle distinct, with 2 short oc. Antenna black; scape without setulae, pedicel with circlet of black subapical setulae; first flagellomere distinctly longer than wide, with 1 dorsal setula; arista black, bare, apical 1/7 or so thin. Proboscis nearly as long as head, blackish. Palpus blackish, with 5 ventral setulae.

Thorax black with distinct pale gray pollinosity. Setulae and setae on thorax black, setulae mostly rather short and weak; ppn absent, 2 npl (posterior npl long), irregularly quadriseriate acr, uniseriate dc nearly as long as acr, 1 long prsc, 1 long psa; scutellum with 2 long sc and 10 short marginal setulae (2 setulae located between sc). Legs nearly entirely black except knees brownish. Setulae and setae on legs black. Fore femur 1.4 times and hind femur 2.4 times as wide as mid femur. Hind femur distinctly thickened, with 2 preapical ad, three rows of ventral spines on weak denticles (8 long sparse av, 16 short dense mv and 4 pv only at base). Fore tibia with 5 mostly weak ad; apically with 4 setae (1 ad very long). Mid tibia with 2 very long ad and 2 very long av; apically with 5 setae (which of 1 av is very long). Mid tarsomere 1 with 1 long pv at extreme base. Hind tarsomeres 1–2 with row of very short spinose av. Wing hyaline, slightly tinged brownish; stigma distinct, dark brown; veins brown, R4+5 and M1 weakly divergent apically. Squama yellow with pale yellow setulae. Halter yellow with dark brown base.

Abdomen strongly curved downwards, somewhat shiny black with pale gray pollinosity; hypopygium distinctly swollen. Setulae and setae on abdomen dark yellow except hypopygium with black setulae and setae.

Male genitalia ( Figs 17–20 ). Left epandrial lamella nearly as long as right epandrial lamella, with slightly convex inner margin near base; left surstylus short and wide with short acute lateral corner. Right epandrial lamella irregularly convex at middle; right surstylus wide and rounded with short spinose marginal setae and nearly fingerlike inner process. Hypandrium distinctly longer than wide, apically acute.

Female. Unknown.

Type material. HOLOTYPE ♂, CHINA, Shaanxi, Ningshan (N33°18′ 44.05″ E108°18′ 34.73″), Xunyangba Town, 1365 m, 2013. VIII.12, Y.Q. Xi. PARATYPES 2 ♂, Shaanxi, Ningshan (N33°18′ 44.05″ E108°18′ 34.73″), Xunyangba Town, 1365 m, 2013. VIII.12/13, Y.Q. Xi.

Distribution. China (Shaanxi).

Etymology. The specific name refers to the collector Yuqiang Xi.

Remarks. This new species is somewhat similar to H. xishuangbannaensis Yang & Yang from Yunnan, but can be easily separated from it by the following characters: wing tinged brownish; pterostigma distinct, dark brown; right surstylus widely rounded with spinose marginal setae and an inner process. In H. xishuangbannaensis , the wing is not tinged brownish; the pterostigma is indistinct, brownish; and the right surstylus has no inner process and marginal denticles ( Yang & Yang 2004).

Figures

FIGURES 17 – 20. Hybos xii sp. nov. (male). 17. Genitalia, dorsal view; 18. right surstylus; 19. left surstylus; 20. hypandrium, ventral view. Scale bar = 0.1 mm.