Hybos yinyuhensis, Yang & Li, 2011

Yang, Ding & Li, Weihai, 2011, Two New Species of Hybos Meigen from Oriental China (Diptera, Empidoidea, Hybotidae), Revue suisse de Zoologie 118 (1), pp. 93-98 : 96-97

Hybos yinyuhensis sp. n. Fig. 2

HOLOTYPE: Male, Hubei, Shennongjia, Yinyuhe , 18. VII. 2009, Qifei Liu ( CAU) . PARATYPES: 3 males, same data as holotype ( CAU & MHNG) .

ETYMOLOGY: The specific name refers to the type locality.

DIAGNOSIS: Legs entirely black. In the middle of the row of the light brown pv setae on mid femur with 3-4 black setae. Right surstylus, straight, short and wide. Otherwise morphologically similar to H. biancistroides sp. n.

DESCRIPTION MALE: Body length 3.4-3.5 mm, wing length 3.5-3.6 mm.

Head: black, pale gray microtrichose. Eyes contiguous on frons; upper facets distinctly enlarged. Setae and setulae on head black; ocellar tubercle distinct, with one pair of long oc. Antenna black; scape bare; pedicel with a circle of subapical setulae; first flagellomere without dorsal setulae, 1.5-1.6 times as long as wide; arista black, 4.4-4.5 times as long as first flagellomere, short pubescent (longest rays shorter than basal diameter of arista) except apical 1/4 thin and bare. Proboscis black; palpus black with 3-4 long ventral setulae.

Thorax: black, pale gray microtrichose. Setae and setulae black; postpronotal lobe setuloae but true h absent, 2 npl (anterior npl short), acr irregularly biseriate, 1 distinct posterior dc and 6-7 setulae anteriad, 1 distinct presc (slightly shorter than posterior dc), 1 long psa; scutellum with 2 (pairs of) short lateral setulae, 2 (pairs of) short apical setulae and 1 pair of long subapical setae. Legs entirely black. Setulae on legs mostly pale, setae black. Fore femur 1.2 times as wide as mid femur, with one row of pale, long pv setulae; mid femur with 1 preapical anterior seta and with one row of pale, long pv setulae (but 3-4 pv setulae at middle black and strong); hind femur 2.3- 2.7 times as wide as mid femur, with 3-4 ad in apical half, and with 9-10 av (mostly longer than v and pv), 14 v (7 sparse v on basal 1/2 and 7 dense v on apical 1/2), 5 pv on basal 1/4, which are spine-like and inserted on weak tubercles. Fore tibia with 4-5 almost dorsal setae (1 seta near middle conspicuously long), apically with 1 ad and 1 very long, weak pv; mid tibia with 3 ad (2 basal ad very long), apically with 4 setae (1 av very long); hind tibia apically without distinct strong setae. Mid tarsomere 1 with two rows of short v; hind tarsomeres 1-2 with short ventral spines. Wing hyaline; stigma dark brown; veins dark brown, R 4+5 and M 1 indistinctly divergent apically. Squama yellow, bordered with pale setulae. Halter pale yellow with dark brown base.

Abdomen: weakly curved downward, black, gray microtrichose. Setulae and setae pale except for some black setae on hypopygium.

Male genitalia (Fig. 2): right epandrial lobe with slightly concave inner margin at middle, right surstylus straight, short and wide with a small, shining black wart-like tubercule just below; left epandrial lobe with slightly concave inner margin, left surstylus with a short, basal and a long, apical process (long process almost straight, wide and knife-like); hypandrium distinctly longer than wide, apically narrowed toward its tip.

FEMALE: Unknown.

FIG. 2

Hybos yinyuhensis sp. n. (male). (A) Genitalia, dorsal view. (B) Right surstylus. (C) Left surstylus. (D) Hypandrium, ventral view.

DISTRIBUTION: China (Hubei).

REMARKS: The new species is morphologically similar to Hybos biancistroides sp. n., and runs to the same couplet in the key of Yang & Yang (2004), but it can be separated from the latter by 3-4 medially black pv setae on mid femur (all light brown in H. biancistroides ), and its right surstylus which is straight, short and wide (thick and apically with a hook in H. biancistroides ).