Oedalea linzhiensis, Zeng & Lin & Yang, 2022

Zeng, Wei, Lin, Chen & Yang, Ding, 2022, Four new species of Oedalea (Diptera, Empidoidea, Hybotidae, Oedaleinae) from China with a key to south eastern Asian species, Zootaxa 5141 (6), pp. 553-567 : 554-557

2. Oedalea linzhiensis sp. nov.

( Figs 1–7 )

Diagnosis. Palpus brown. Antenna 1.3 times as long as head, dark brown, except scape blackish; first flagellomere 7.2 times longer than wide. Hairs on mesonotum somewhat sparse, acr separated distinctly from dc on anterior 3/5. Pterostigma short and wide, trapezoidal, more oblique at outer margin. Halter with dark brown knob and brown stem. Right surstylus about twice longer than basal width; left surstylus nearly quadrate, nearly as long as wide, with slightly concave upper margin.

Description. Male ( Fig. 1 ). Body length 3.8–3.9 mm, wing length 3.2–3.3 mm. Head ( Fig. 2 ) height 0.6 mm, black with gray short pollinosity. Eyes brownish black, contiguous on frons; clypeus shiny black. Hairs and bristles on head black, lower occiput with black and brownish yellow hairs. Ocellar tubercle distinct with 2 oc and 2 posterior hairs; upper occiput with 5–6 long postocular bristles slightly curved forward and inward. Antenna 1.3 times as long as head, dark brown, except scape blackish; scape with black dorsal bristles; pedicel with circlet of black apical bristles; first flagellomere greatly elongated, 7.2 times longer than wide, short dark brown pubescent; stylus dark brown, nearly spine-like, 2/3 as long as basal width of first flagellomere. Proboscis 0.6 times as long as head height, pale brownish yellow with black hairs; palpus pale brownish yellow with black hairs.

Thorax subshiny black with thin gray pollinosity. Hairs on thorax short, pale yellow except those on pronotum dark brown, bristles brown to dark brown; hairs on mesonotum somewhat sparse; ppn absent; acr and dc multiseriate, acr distinctly separated from dc on anterior 3/5, but postsutural not separated; 2 npl (anterior one short, posterior one long), 1 psa, 1 long prsc dc; 3 pairs of sc. Legs pale yellow to brownish yellow, except hind tibia blackish on apical 2/3; tarsi from apex of tarsomere 1 blackish onward. Fore tibia slightly thickened, hind tibia slightly curved. Hairs and bristles on legs blackish; coxae with brown hairs and bristles. Fore femur slightly thickened, 1.2 times as wide as mid femur; hind femur distinctly thickened, 3.0 times as wide as mid femur, with about four rows of black, ventral spine-like bristles apically (outer av and pv rather long). Wing ( Fig. 3 ) nearly hyaline, faintly brown above discal cell and M 1; dark brown pterostigma short and wide, trapezoidal, more oblique at outer margin, reaching R 2+3 posteriorly; veins dark brown, R 2+3 distinctly curved around pterostigma, M 2 complete. Squama dark yellow with dark yellow hairs. Halter with dark brown knob and brown base.

Abdomen nearly straight, somewhat shiny blackish with gray pollinosity, except segments 1–4 dark brown. Hairs and bristles on abdomen dark yellow, except those on apex blackish. Hypopygium distinctly narrower than pregenital segments.

Terminalia ( Figs 4–7 ): Left and right cerci ( Fig. 4 ) digitiform, apically slightly narrowed. Basal bridge of epandrium ( Fig. 4 ) somewhat wide; left and right epandrial lamellae ( Fig. 4 ) broad. Right epandrial lamella ( Fig. 6 ) subrectangular (lateral view); right surstylus about twice longer than wide, apically slightly curved ventrally. Left epandrial lamella ( Fig. 5 ) trapezoidal (lateral view); left surstylus nearly quadrate, nearly as long as wide, with slightly concave apical margin (lateral view). Hypandrium ( Fig. 7 ) much longer than wide, apically with large lateral incision.

Female. Unknown.

Type material. HOLOTYPE ♂, Tibet, Linzhi, Pailong, Laoqiao [30°2′33″N, 95°0′35″E, 2177 m], 2019.IV.26, Qicheng Yang ( CAU) . PARATYPE: 1 ♂, same data as holotype ( CAU) .

Distribution. China (Tibet).

Remarks. The new species is somewhat similar to O. vietnamensis , but may be separated from the latter by the following features: first flagellomere 7.2 times longer than wide; pedicel and first flagellomere dark brown, scape blackish (first flagellomere yellowish brown, paler than brownish scape and pedicel in O. vietnamensis ); pterostigma shorter, trapezoidal, more oblique at outer margin; mesonotum with black bristles (yellow bristles in O. vietnamensis ); base of halter brown (yellow in O. vietnamensis ). This new species may be easily separated from Oedalea yangi sp. nov. by the antenna rather short, 1.3 times longer than head height (antenna 1.8 times as long as head height in O. yangi sp. nov.); first flagellomere 7.2 times longer than wide (first flagellomere 12.0 times longer than wide in O. yangi sp. nov.); halter dark brown with brown base (halter yellow in O. yangi sp. nov.).

Etymology. The specific name refers to the type locality Linzhi district.

Figures

FIGURES 1–3. Oedalea linzhiensis sp. nov. (male). 1. Adult habitus, lateral view; 2. Head, lateral view; 3. Wing.

FIGURES 4–7. Oedalea linzhiensis sp. nov. (male). 4. Genitalia, dorsal view; 5. Left epandrial lamella, lateral view; 6. Right epandrial lamella, lateral view; 7. Hypandrium and phallus, ventral view. Abbreviations: see Material and methods.