Hybos brevidigitatus, 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 brevidigitatus sp. nov.

Fig. 5

Type material examined.

Holotype: China •♂; Fujian, Wuyishan, Feicuigu; 203 m, 15 April 2021; Ding Yang; CAU.

Diagnosis.

Arista pubescent. Legs dark yellow, except hind coxae brownish yellow; hind femur blackish brown with blackish tip; hind tibiae dark brown and all tarsomeres 3 and 5 brown. Hypandrium with apico-lateral incision bearing one subtriangular process with long bristles.

Description.

Male. Body length 3.6 mm, wing length 3.7 mm.

Head blackish brown with gray pilosity. Eyes contiguous on frons, dark brown with indistinctly enlarged dorsal facets dark yellow. Hairs and bristles on head blackish brown except postero-ventral surface with partly dark yellow hairs; ocellar tubercle indistinct, with two long oc and two short posterior hairs. Antenna blackish brown; scape without hairs, pedicel with circlet of dark brown subapical hairs; first flagellomere dark brown, much elongated, longer than scape and pedicel combined, without dorsal hairs; arista brown, pubescent, except apical 1/3 thin and bare. Proboscis slightly shorter than head, dark brown. Palpus brownish, with one ventral hair and one apical hair.

Thorax dark brown with gray pilosity. Hairs on thorax brown, bristles dark brown; hairs on mesonotum sparse, slightly long, ppn absent, two npl (posterior npl long strong), uniserial hair-like dc nearly as long as irregularly biserial acr, one long prsc, one psa; scutellum with eight marginal hairs (~ 1/3 as long as sc) and two very long sc. Legs dark yellow, except hind coxae brownish yellow; hind femur blackish brown with blackish tip; hind tibiae dark brown and all tarsomeres 3 and 5 brown. Hairs on legs dark yellow to brown, bristles brownish yellow to blackish brown, but those on coxae dark yellow. Fore femur 1.3 × and hind femur 2.6 × as wide as mid femur. Fore femur with one row of weak pv ~ 2/5 as long as femur thickness. Mid femur with four or five weak ad on basal 1/2 and one row of pv. Hind femur with three irregular rows of ventral bristles on tubercles (av rather long, short spine-like ventral bristles on distinct tubercles on apical 1/3, pv row interrupted medially with five short pv at base and five very long pv at apex respectively) and one long strong preapical ad. Fore tibia apically with one rather long ad and pd. Mid tibia with two very long ad on basal 2/3; apically with six bristles including one very long pv. Hind tibia with one ad near base. Fore tarsomere 1 with one row of long hair-like ad and pd. Mid tarsomere 1 with one pair of ventral bristles at extreme base. Hind tarsomeres 1 and 2 with several short spine-like ventral bristles. Wing hyaline, slightly tinged brownish, stigma brownish; veins brown, R4+5 and M1 divergent apically. Squama dark yellow with yellow hairs. Halter yellowish brown with brownish knob.

Abdomen weakly curved downward, brown with pale gray polinosity; hairs and bristles brownish to dark brown except those on hypopygium partly blackish brown. Hypopygium nearly as thick as pregenital segments.

Male genitalia. Left epandrial lamella nearly as wide as right epandrial lamella, with slightly convex inner margin near middle (Fig. 5b ); left surstylus nearly trapezoid, wide apically and with one small obtuse subtriangular inner process in lateral view (Fig. 5d ). Right epandrial lamella with concave inner margin; right surstylus truncate apically, with one finger-like process (Fig. 5c ). Hypandrium ~ 2.8 longer than wide, apically slightly wide, with apico-lateral incision bearing one subtriangular process with long bristles (Fig. 5e ).

Female. Unknown.

Etymology.

This specific name refers to the hypandrium trifurcated with one small figure-like left process.

Distribution.

China (Fujian).

Remarks.

The new species is similar to H. wangae Yang, Merz & Grootaert from Guangdong, but may be separated from the latter by the hind tibia with only one ad near base and right surstylus short in lateral view. In H. wangae , the hind tibia does not have bristles at base, and the right surstylus is long in lateral view ( Yang et al. 2006).

Figures

Figure 5. Hybos brevidigitatus sp. nov. a male habitus, lateral view b genitalia, dorsal view c right surstylus d left surstylus e hypandrium, ventral view.