Hybos modificatus, 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 modificatus sp. nov.

Fig. 19

Type material examined.

Holotype: China • ♂; Fujian, Wuyishan, Tongmucun, Guadun; 1,033 m, 22 June 2021; Xiaodong Cai; CAU. Paratypes: China • 9♀♀, same as holotype; CAU. China • 10♀♀, Fujian, Wuyishan, Tongmucun, Baihuxi; 736 m, 22 June 2021; Xiaodong Cai; CAU.

Diagnosis.

Legs entirely black. Hind tibia with some ad and pd hairs (long pd near apex). Fore tarsomere 2 with one long subapical ad. R2+3 curved, R4+5 and M1 convergent apically. Hypandrium nearly quadrate, with slightly incised apical margin.

Description.

Male. Body length 3.6 mm.

Head black with gray pilosity. Eyes contiguous on frons, dark brown with distinctly enlarged dorsal facets brownish yellow. Hairs and bristles on head blackish except postero-ventral surface with partly dark brown hairs; ocellar tubercle indistinct with two long oc and two short posterior hairs. Antenna blackish; scape without hairs, pedicel with circlet of blackish subapical hairs; first flagellomere blackish brown, not elongated or slightly elongated, nearly as long as or longer than scape and pedicel combined, without dorsal hairs; arista blackish brown, rather long and short pubescent except apical ~ 1/4 thin and bare. Proboscis slightly shorter than head, blackish. Palpus dark brown, with one ventral hair and one apical hair.

Thorax black with gray pilosity. Hairs on thorax blackish, bristles black; hairs on mesonotum short, ppn absent, two npl (anterior npl rather short), uniserial hair-like dc nearly as long as irregularly hexaserial acr, two long prsc, one psa; scutellum with six short marginal hairs (~ 1/4 as long as sc) and two very long sc. Legs entirely black. Hairs on legs mostly blackish brown to blackish, bristles blackish to black, but those on coxae blackish brown and hind coxae with partly brown, long bristles. Fore femur 1.3 × and hind femur 2.2 × as wide as mid femur. Fore femur with one row of pv longer than femur thickness. Mid femur with four or five long ad on basal 1/2 and one row of pv (middle pv very long, much longer than femur thickness). Hind femur with three ad and ~ 3 rows of spine-like ventral bristles (av rather strong, very short dense mv on distinct tubercles, pv long thin). Fore tibia with one row of ad and pv (long ad and pv on apical 1/3); apically with three or four bristles including one very long ad and pv. Mid tibia with three long strong ad on basal 2/3 and two long av on apical 1/2. Hind tibia with some ad and pd hairs (long pd near apex). Fore tarsomere 1 with two long ad, three or four long pv hairs and three apical bristles including one long subapical ad. Fore tarsomere 2 with one long subapical ad. Mid tarsomere 1 with two ad on apical 1/2. Hind tarsomeres 1 and 2 with one row of short dense spine-like ventral bristles. Wing hyaline, stigma dark brown; veins dark brown, R2+3 curved, R4+5 and M1 convergent apically. Squama dark yellow with dark yellow hairs. Halter dark yellow with brownish yellow stem and pale yellow knob.

Abdomen straight, black with gray pilosity; hypopygium distinctly thicker than pregenital segments. Hairs and bristles on abdomen blackish brown to black, but basally with some brownish hairs and bristles.

Male genitalia. Left epandrial lamella and right epandrial lamella widely separated, slightly wide (Fig. 19b ); left surstylus obtuse apically, with one long finger-like curved process. Right epandrial lamella very wide, with weakly convex inner margin near base (Fig. 19d ); right surstylus long thin, narrow, and acute apically, directed inward in lateral view (Fig. 19c ). Hypandrium ~ 1.3 × longer than wide, nearly quadrate, with slightly incised apical margin (Fig. 19e ).

Female. Body length 4.0-4.8 mm, wing length 3.4-4.2 mm. Similar to male, but slightly bigger. Scutellum with six long marginal hairs (~ 1/2 as long as sc). Mid tibia with some long hairs. Hind tibia with one dorsal bristle on apical 1/3. Hind tarsomere 1 with some slightly long dorsal hairs. Terminalia black with some strong black bristles. Tergite 7 not encircling abdomen, tubular in lateral view (Fig. 19h ); 0.7 × longer than wide, nearly quadrate with weakly convex basal margin, membranous at apical margin in dorsal view (Fig. 19f ). Sternite 7 apico-lateral corner slightly protuberant in lateral view (Fig. 19h ); nearly quadrate with four strong bristles at apical margin, membranous at apical margin and each side, nearly as long as wide in ventral view (Fig. 19g ). Tergite 8 long thin with dense bristles in lateral view (Fig. 19h ); weakly sclerotized and nearly trapezoid in dorsal view (Fig. 19f ). Sternite 8 partly membranous, large, and wide in lateral view (Fig. 19h ); somewhat quadrate, slightly incised apically nearly as long as wide in ventral view (Fig. 19g ). Tergite 10 very weakly sclerotized, hardly differentiated. Sternite 10 membranous on dorsal portion, subtriangular in lateral view (Fig. 19h ); rounded, slightly acute basally in ventral view (Fig. 19g ).

Etymology.

This specific name refers to the fore tarsomere 2 with one long subapical ad.

Distribution.

China (Fujian).

Remarks.

The new species is similar to H. obtusatus Yang & Grootaert from Guizhou and Guangdong, but may be separated from the latter by the hind tibia with some ad and pd hairs, and R4+5 and M1 convergent apically. In H. obtusatus , the hind tibia does not have ad and pd hairs, and R4+5 and M1 are parallel apically ( Yang and Grootaert 2005).

Figures

Figure 19. Hybos modificatus sp. nov. a male habitus, lateral view b 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.