Hybos constractus, 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 constractus sp. nov.

Fig. 8

Type material examined.

Holotype: China •♂; Fujian, Wuyishan, Xiaonandingkeng; 1,000 m, 14-27 July 2021; Junli Yao (Malaise trap); CAU.

Diagnosis.

Ocellar tubercle with two short weak oc and without posterior hairs. Legs mostly dark yellow to brownish yellow. Hind femur distinctly thickened. Hind tibia with one long ad and pd near middle. Hypandrium furcated apically.

Description.

Male. Body length 4.9 mm, wing length 4.8 mm.

Head black with gray polinosity. Eyes contiguous on frons, blackish brown with distinctly enlarged dorsal facets brownish. Hairs and bristles on head blackish except postero-ventral surface with partly brownish yellow hairs; ocellar tubercle indistinct with two short weak oc and without posterior hairs. Antenna blackish; scape without hairs, pedicel with circlet of blackish subapical hairs; first flagellomere blackish brown except with yellow extreme base, slightly elongated, longer than scape and pedicel combined, without dorsal hairs; arista blackish brown, short pubescent except apical ~1/4 thin and bare. Proboscis nearly as long as head, blackish. Palpus dark brown, with single ventral hair and one apical hair.

Thorax black with gray polinosity. Hairs on thorax blackish except partly brown, bristles black; hairs on mesonotum short, ppn absent, two npl (anterior npl short), uniserial hair-like dc nearly as long as irregularly hexaserial acr, one long prsc, one psa; scutellum with six marginal hairs (2 hairs between sc) and two very long sc. Legs mostly dark yellow to brownish yellow, except base of fore and mid coxae black; hind coxa except extreme tip, knee and femur black; extreme tip of hind femur dark brown and all tarsomeres 3 and 5 blackish brown. Hairs on legs mostly brownish yellow to brown partly dark brown, bristles blackish brown to black, but those on coxae dark yellow; fore and mid femur with partly brownish yellow hairs; hind femur with partly dark yellow hairs. Fore femur 1.3 × and hind femur 1.8 × as wide as mid femur. Fore femur with one row of weak pv shorter than femur thickness, circlet of preapical bristles including one strong ad. Mid femur with six or seven ad on basal 1/2, one row of weak pv shorter than femur thickness. Hind femur distinctly thickened, 1.7 × as wide as hind tibia, with four or five strong ad on apical 1/2, ~ 3 irregular rows of ventral bristles on distinct tubercles mostly long strong. Fore tibia with one weak ad near base, one ad at middle and one strong preapical ad, one preapical av and pv. Mid tibia with one very long strong av near middle, four or five strong ad (1 basal ad very long) on apical 2/3, one long pd near apex; apically with five bristles including one long av. Hind tibia with one long ad and pd at middle, one weak pd near base and one preapical pd. Fore tarsomere 1 with one preapical ad and one pv at extreme base. Mid tarsomere 1 with two av at extreme base (of which one long), three rather strong pd and circlet of preapical bristles. Hind tarsomere 1 with two short spine-like ventral bristles and 3-4 short spine-like av. Wing hyaline, stigma dark brown; veins dark brown, R4+5 and M1 divergent apically. Squama dark yellow with dark yellow hairs. Halter dark yellow with brownish yellow stem and pale yellow knob.

Abdomen nearly straight, black with pale gray polinosity. Hairs and bristles on abdomen dark yellow to brownish except those on hypopygium mostly brown and partly black. Hypopygium slightly thicker than pregenital segments.

Male genitalia. Left epandrial lamella slightly narrower than right epandrial lamella, with convex inner margin near middle (Fig. 8b ); left surstylus trifurcated, with one small subtriangular inner process, one long median process (thick and curved apically), one short wide outer process (nearly trapezoid) (Fig. 8d ). Right epandrial lamella with inner margin obliquely subtruncate; right surstylus with one wide finger-like process and weak apical incision (Fig. 8c ). Hypandrium ~ 2.1 × longer than wide, basally narrow, furcated apically with one wide right process and one narrow curved left process (Fig. 8e ).

Female. Unknown.

Etymology.

This specific name refers to the hypandrium basally narrow.

Distribution.

China (Fujian).

Remarks.

The new species is similar to H. chinensis Frey, but may be separated from the latter by the right surstylus without denticles and hypandrium bifurcated apically. In H. chinensis , the right surstylus has the denticles at inner margin, and the hypandrium is not furcated ( Yang and Yang 2004).

Figures

Figure 8. Hybos constractus sp. nov. a male habitus, lateral view b genitalia, dorsal view c right surstylus d left surstylus e hypandrium, ventral view.