Hybos curvitibia, Li & Yang, 2023

Li, Meilin & Yang, Ding, 2023, New species and records of the genus Hybos Meigen (Diptera, Empidoidea, Hybotinae) from Wuyishan National Park, China, ZooKeys 1172, pp. 313-351 : 313

Hybos curvitibia sp. nov.

Fig. 9

Type material examined.

Holotype: China •♂; Fujian, Wuyishan, Dazhulan; 935-1,035 m, 3 July 2009; Xiaoyan Liu; CAU. Paratypes: China • 2♂♂ 17♀♀, same as holotype; CAU. China • 1♂, Fujian, Wuyishan, Dingweizhan; 600 m, 10 July 2009; Xiaoyan Liu; CAU. China • 1♂, Fujian, Wuyishan, Liaowangtai; 1,160 m, 10-17 May 2021; Junli Yao (Malaise trap); CAU.

Diagnosis.

Legs entirely blackish. Hind tibia slightly curved basally, with single very long ad at middle. Hind femur swollen at middle. R2+3 weakly curved, R4+5 and M1 weakly convergent apically. Hypandrium narrow basally, with truncate apical margin and one small irregular process apically.

Description.

Male. Body length 3.3-3.7 mm, wing length 3.3-3.5 mm.

Head black, pale gray pilosity. Eyes contiguous on frons, dark yellow, with enlarged upper facets. Hairs and bristles on head black; ocellar tubercle indistinct, with one pair of long oc and two very short posterior hairs. Antenna blackish; scape without hairs; pedicel with circlet of subapical hairs; first flagellomere slightly elongated, without dorsal hairs; arista blackish, very short pubescent except apical ~ 1/4 bare thin. Proboscis blackish; palpus blackish with single hair at extreme tip.

Thorax black, pale grey pilosity; pleuron subshiny. Hairs and bristles black; h absent, two npl (anterior npl short, posterior npl long strong), acr nearly quadriserial, one long posteriormost dc and six hairs anteriad, one long prsc, one long psa; scutellum with six short marginal hairs and two long subapical bristles. Legs entirely black. hairs and bristles on legs black. Fore femur 1.1 × and hind femur 1.9 × as wide as mid femur. Fore femur with one row of pv hairs (of which some hairs very long). Mid femur with eight very long pv hairs. Hind femur with four long ad at apex, three rows of spine-like v, and with seven or eight very long av hairs on middle 1/3. Fore tibia (except basal portion) with very long hairs. Mid tibia with long hairs and three long ad; apically with one very long av. Hind tibia slightly curved basally, with one long thin ad hair at middle and one long thin ad hair at tip. Fore tarsomeres 1 and 2 with very long hairs; mid tarsomere 1 with one long d at basal 1/3 and one long d at tip, basally with very long hairs. Wing slightly grayish; stigma long, dark brown; veins dark brown, R2+3 weakly curved, R4+5 and M1 weakly convergent apically. Squama dark yellow, bordered with pale hairs. Halter brown.

Abdomen somewhat short thick, weakly curved downward, dark brown with pale gray polinosity except hypopygium black; hairs and bristles dark brown. Hypopygium distinctly thicker than pregenital segments.

Male genitalia. Left epandrial lamella slightly wider than right epandrial lamella (Fig. 9b ); left surstylus rather wide, with one short thin subtriangular process, curved inward in lateral view. Right epandrial lamella with inner margin nearly straight (Fig. 9d ); right surstylus with one finger-like process, apically narrow, lateral margin bearing one small hook-like process (Fig. 9c ). Hypandrium ~ 2 × longer than wide, narrow basally, with truncate apical margin and one small irregular process apically (Fig. 9e ).

Female. Body length 3.6 mm, wing length 3.2 mm. Similar to male, but fore femur with one row of short to long pv hairs. Mid femur without very long pv hairs. Hind femur with four slightly long ad and without very long av hairs. Fore tibia with slightly long hairs. Mid tibia with one long av at middle. Hind tibia straight. Fore tarsomeres 1 and 2 with shorter hairs. Mid tarsomere 1 basally without very long hairs. Terminalia dark brown. Tergite 7 not encircling abdomen, tubular with one acute apico-lateral corner in lateral view (Fig. 9h ); 0.6 × longer than wide, nearly quadrate with weakly concave basal margin in dorsal view (Fig. 9f ). Sternite 7 baso-lateral and apico-lateral corner slightly protuberant in lateral view(Fig. 9h ); narrow basally, nearly trapezoid in ventral view (Fig. 9g ). Tergite 8 partly membranous, nearly long trapezoid in lateral view (Fig. 9h ). Sternite 8 partly membranous, slightly long, and wide in lateral view (Fig. 9h ); somewhat quadrate, slightly incised basally nearly as long as wide in ventral view (Fig. 9g ). Tergite 10 very weakly sclerotized, hardly differentiated. Sternite 10 membranous on dorsal portion, subtriangular in lateral view (Fig. 9h ); wide medially, narrow basally and apically in ventral view (Fig. 9g ).

Etymology.

This specific name refers to the male hind tibia slightly curved basally.

Distribution.

Fujian (Wuyishan).

Remarks.

The new species is similar to H. leucopogus sp. nov., but may be separated from the latter by the male hind tibia slightly curved basally, and right surstylus with one small hook-like process at lateral margin. In H. leucopogus sp. nov., the hind tibia is straight with one row of ad hairs, and the right surstylus does not have the hook-like process. The female of this new species is similar to H. modificatus sp. nov., but may be separated from the latter by the sternite 7 baso-lateral and apico-lateral corner slightly protuberant in lateral view and narrow basally, nearly trapezoid in ventral view. In H. modificatus sp. nov., the apico-lateral corner of sternite 7 is slightly protuberant in lateral view, and is nearly quadrate in lateral view

Figures

Figure 9. Hybos curvitibia sp. nov. a male habitus, lateral view b male genitalia, dorsal view c right surstylus d left surstylus e hypandrium, ventral view f-h female terminalia f dorsal view g ventral view h lateral view. Abbreviations: S 7 = sternite 7; T 7 = tergite 7; S 8 = sternite 8; T 8 = tergite 8; S 10 = sternite 10; T 10 = tergite 10.