Hybos dazhulanus, 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 dazhulanus sp. nov.

Fig. 10

Type material examined.

Holotype: China •♂; Fujian, Jianyang, Dazhulan; 920 m, 16 April 2021; Ding Yang; CAU. Paratypes: China • 2♂♂ 1♀, same as holotype; CAU. China • 1♂, Fujian, Wuyishan, Xianfengling; 1,147 m, 10-17 May 2021; Junli Yao (Malaise trap); CAU.

Diagnosis.

First flagellomere much elongated, arista bare. Legs mostly blackish brown to blackish. Abdomen somewhat long narrow. Left surstylus slightly long, narrow apically, with one subtriangular process in lateral view; right surstylus rather wide, with shallow apical incision.

Description.

Male. Body length 4.7-4.75 mm, wing length 4.0-4.3 mm.

Head black with gray pilosity. Eyes contiguous on frons, dark brown with indistinctly enlarged dorsal facets brownish yellow. Hairs and bristles on head blackish except postero-ventral surface with partly brownish 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 dark brown, much elongated, longer than scape and pedicel combined, without dorsal hairs; arista dark brown, bare except apical ~ 1/4 thin. Proboscis shorter than head, blackish. Palpus dark brown, with two ventral hairs and one apical hair.

Thorax black with gray pilosity. Hairs on thorax blackish, bristles black; hairs on mesonotum short to slightly long, ppn absent, two npl (posterior npl long strong), uniserial hair-like dc nearly as long as irregularly quadriserial acr, one very long prsc, one long psa; scutellum with eight marginal hairs (2 hairs located between sc) and two rather long sc. Legs mostly blackish brown to blackish, except fore and mid coxae, tibiae dark brown; hind knee and all tarsi blackish brown; extreme base of hind tibia brownish yellow. Hairs on legs mostly brown to blackish brown, bristles blackish brown to black, but coxae with partly dark yellow hairs; hind femur and tibia with partly brownish hairs. Fore femur 1.2 × and hind femur 2.3 × as wide as mid femur. Fore femur with one row of weak pv shorter than femur thickness and circlet of preapical bristles. Mid femur with one row of ad on basal 1/2 and one row of pv (middle pv rather long, longer than femur thickness). Hind femur with ~ 3 rows of ventral bristles (av long strong, short spine-like mv on distinct tubercles, long thin pv on basal 1/3), some dense ventral hairs and one preapical ad. Fore tibia with one ad near middle; apically with four bristles including one long ad. Mid tibia with two very long ad on basal 1/2 and one very long av at middle; apically with five bristles including one very long av. Hind tibia apically with one very long thin pd and some dense ventral hairs. Hind tarsomere 1 with one row of short dense spine-like ventral bristles and one short thick apical av. Wing hyaline, stigma brown; veins dark brown, R4+5 and M1 weakly divergent apically. Squama dark yellow with dark yellow hairs. Halter yellow with pale yellow knob.

Abdomen somewhat long narrow, apically weakly curved downward, blackish with pale gray pilosity; hypopygium nearly as thick as pregenital segments. Hairs and bristles on abdomen brownish yellow to brown except those on hypopygium dark brown.

Male genitalia. Left epandrial lamella nearly as wide as right epandrial lamella, with convex inner margin near middle (Fig. 10b ); left surstylus narrowing toward tip, with one obtuse subtriangular inner process in lateral view (Fig. 10d ). Right epandrial lamella with concave inner margin near apex; right surstylus short and wide, nearly quadrate, with shallow apical incision (Fig. 10c ). Hypandrium ~ 2.6 × longer than wide, basally narrow, apically with weak lateral incision (Fig. 10e ).

Female. Body length 4.3-5.3 mm, wing length 4.8-5.2 mm. Similar to male, but slightly pale. Hind femur and tibia without dense ventral hairs. Terminalia brown. Tergite 8 almost encircling abdomen, sclerotized, wide basally, narrow apically in lateral view (Fig. 10h ); 0.9 × longer than wide, nearly quadrate with shallow apical incision in dorsal view (Fig. 10f ). Sternite 8 bulbous, nearly as long as wide, basally with two indistinct lateral processes in ventral view (Fig. 10g ), apically somewhat narrowed. Tergite 10 very weakly sclerotized, hardly differentiated. Sternite 10 weakly sclerotized, finger-like in lateral view (Fig. 10h ); somewhat quadrate, narrowing toward tip, nearly as long as wide in ventral view (Fig. 10g ). Cerci short, somewhat round, sclerotized at tip (Fig. 10f ).

Etymology.

This specific name refers to the type locality Dazhulan.

Distribution.

China (Fujian).

Remarks.

The new species is similar to H. guanmenshanus Huo, Zhang & Yang from Hubei, but may be separated from the latter by the hind tibia brownish yellow at extreme base and right surstylus short and wide, nearly quadrate. In H. guanmenshanus , the hind tibia is entirely black, and the right surstylus is nearly finger-like apically ( Huo et al. 2010).

Figures

Figure 10. Hybos dazhulanus 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.