Hybos longidigitatus, 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 longidigitatus sp. nov.

Fig. 17

Type material examined.

Holotype: China •♂; Fujian, Wuyishan, Liaowangtai; 1,160 m, 10-17 May 2021; Junli Yao (Malaise trap); CAU. Paratype: China • 1♀, Fujian, Wuyishan, Wulichang; 825 m, 1-8 June 2021; Junli Yao (Malaise trap); CAU.

Diagnosis.

Arista bare. Legs mostly yellow to dark yellow except hind femur with brownish black tip and all tarsomeres 3 and 5 dark brown. Hind tibia with one row of short thin pd on apical 1/2. Hypandrium with apico-lateral incision bearing one long thin finger-like process.

Description.

Male. Body length 3.7 mm, wing length 3.1 mm.

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

Thorax black with gray pilosity except pleuron dark brown or blackish brown. Hairs on thorax brown, bristles blackish brown; hairs on mesonotum short to slightly long, ppn absent, two npl (posterior npl very long), uniserial hair-like dc nearly as long as irregularly quadriserial acr, one very long prsc, one long psa; scutellum with six marginal hairs (~ 1/3 as long as sc) and two very long sc. Legs mostly yellow to dark yellow, except hind femur with brownish black tip and all tarsomeres 3 and 5 dark brown. Hairs on legs brownish to dark brown, bristles dark brown to blackish, but those on coxae dark yellow (coxae rarely with partly brownish bristles); hind tarsi with partly brownish yellow hairs. Fore femur 1.5 × and hind femur 2.0 × as wide as mid femur. Fore femur with one row of weak pv ~ 1/2 as long as femur thickness. Mid femur with one row of long thin pv (middle pv rather long, much longer than femur thickness) and one preapical ad. Hind femur with three irregular rows of ventral bristles (5-6 mostly rather long av along entire length, short spine-like mv on tubercles, dense mv on apical 1/3, long thin pv on apical 1/2, long hair-like pv on apical 1/3). Fore tibia apically with three or four bristles including one very long posterior bristle. Mid tibia with two strong ad on basal 1/2, one very long av at extreme tip. Hind tibia with one row of short thin pd on apical 1/2. Fore tarsomere 1 with three very long thin posterior bristles. Hind tarsomere 1 with one row of short spine-like ventral bristles and one short thick av at extreme tip. Wing hyaline, slightly tinged brownish, stigma brown; veins dark brown, R4+5 and M1 divergent apically. Squama dark yellow with dark yellow hairs. Halter brownish yellow with pale yellow knob.

Abdomen apically weakly curved downward, blackish brown with pale gray pilosity. Hairs and bristles on abdomen brownish to blackish brown. Hypopygium nearly as thick as pregenital segments.

Male genitalia. Left epandrial lamella narrow than right epandrial lamella, with concave inner margin (Fig. 17b ); left surstylus long narrow, finger-like, with hook-like apically (Fig. 17d ). Right epandrial lamella with concave inner margin; right surstylus long, narrow at middle, wide and obtuse apically (Fig. 17c ). Hypandrium ~ 1.6 × longer than wide, with apico-lateral incision bearing one long thin finger-like process (Fig. 17e ).

Female. Body length 3.6 mm, wing length 3.9 mm. Similar to male, but mid femur with shorter pv. Terminalia blackish brown. Tergite 8 almost encircling abdomen, sclerotized, wide basally, nearly semicircular apically in lateral view (Fig. 17h ); 0.6 × longer than wide, somewhat quadrate, basal and apical margin membranous with shallow incision in dorsal view (Fig. 17f ). Sternite 8 hook-like, membranous at apico-lateral margin in lateral view (Fig. 17h ); 1.2 × longer than wide, apical margin slightly narrowed with shallowly incised in ventral view (Fig. 17g ). Tergite 10 very weakly sclerotized, hardly differentiated. Sternite 10 membranous on dorsal portion, acute apically, finger-like in lateral view (Fig. 17h ); 0.8 × longer than wide, rounded in ventral view (Fig. 17g ). Cerci very long, curved downward, sclerotized at tip in lateral view (Fig. 17h ).

Etymology.

This specific name refers to the hypandrium bifurcated apically with one long figure-like process.

Distribution.

China (Fujian).

Remarks.

The new species is similar to H. bigeniculatus Yang & Yang from Hubei, but may be separated from the latter by the hind femur dark yellow with only brownish black tip and all tarsomeres 3 and 5 dark brown. In H. bigeniculatus , the hind femur is blackish brown, and all tarsomeres 3 and 5 are yellow ( Yang and Yang 2004).

Figures

Figure 17. Hybos longidigitatus 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: cer = cercus; S 7 = sternite 7; T 7 = tergite 7; S 8 = sternite 8; T 8 = tergite 8; S 10 = sternite 10; T 10 = tergite 10.