Villa obtusa, Yao, Gang, Yang, Ding & Evenhuis, Neal L., 2009

Yao, Gang, Yang, Ding & Evenhuis, Neal L., 2009, Four new species and a new record of Villa Lioy, 1864 from China (Diptera: Bombyliidae), Zootaxa 2055, pp. 49-60 : 57-59

Villa obtusa sp. nov.

( Figs. 5 , 30–35 )

Diagnosis. Tergites 1–4 with yellow erect hairs and tergites 5–7 with black erect hairs, tergites 2–3 with yellowish recumbent scales on anterior half, and tergites 5–6 with yellowish recumbent scales posteriorly; sternite 4 with white scales. Gonostylus acute and narrowed from base to tip in lateral view; epiphallus with a nearly round tip in dorsal view.

Description. Male. Body length 13 mm, wing length 12 mm.

Head black; ocellar tubercle reddish brown. Hairs on head black and yellowish; frons with dense black erect hairs and sparse yellowish hairs, face with black erect hairs and dense yellow scales; occiput with short yellowish and black hairs and a row of yellowish erect hairs on edge. Antenna black except first flagellomere dark brown; scape short and thick, twice longer than wide, with dense black hairs; pedicel nearly as long as wide, almost bare; first flagellomere cone-shaped, bare. Antennal ratio: 3:1:6. Proboscis dark brown with black hairs; palpus dark brown with yellowish hairs.

Thorax black with black scales. Hairs on thorax mostly yellow, bristles mostly yellow; postpronotal lobe with long yellow hairs, mesonotum with row of long yellow hairs at anterior margin and three long yellow lateral bristles near base of wing, postalar callus with five bristles, four bristles yellow and apical one black; thorax with black and yellow scales on back. Scutellum with scales-like black hairs on anterior edge and scales-like yellow hairs on posterior edge. Legs dark brown with black scales. Hairs on legs mostly black, bristles black. Femora with sparse long black hairs; tibiae and tarsi short black hairs. Mid femur with six av apically; hind femur with six av apically. Mid tibia with seven ad, nine pd, seven av and 11 pv; hind tibia with eight av, and dense bristle-like hairs all round. Wing ( Fig. 5 ) hyaline with anterior edge brown, with metalline reflecting. Base of vein C with brush-like long black hairs, tegula black, bare. Wing with basicosta normal, and with an acute tip; vein r-m nearly 1/3 the length of discal cell apically. Halteres pale.

Abdomen black. Hairs on abdomen black and yellow; tergites 1–4 with orangish yellow erect hairs and tergites 5–7 with black erect hairs, tergites with black erect hairs on middle and yellow erect hairs on sides, dorsum with dense black recumbent scales except tergites 2 and 3 with yellowish recumbent scales on anterior half, but scales on tergite 3 less, and tergites 5–6 with yellowish recumbent scales posteriorly. Sternites with white erect hairs and dense black recumbent scales except sternite 4 with white scales.

Male genitalia ( Figs. 30–35 ). Epandrium subquadrate, nearly twice longer than high, with dense long black bristles apically; cercus well exposured in lateral view; epandrium longer than wide, slightly narrowed from base to tip in dorsal view; gonocoxa distinctly narrowing apically in ventral view, with numerous black bristle-like hairs apically, with; gonostylus subquadrate, its tip acute; epiphallus subquadrate, with a nearly round tip in dorsal view, distiphallus narrow and obtuse apically in lateral view.

Female. Unknow.

Type material. Holotype male, CHINA: Xizang, Chayu Hongweicun (N 97°06’ E 28°28’), 1. VII. 1978, Fasheng Li.

Distribution. China (Xizang).

Etymology. The species epithet derives from the Latin “ obtusa ”; referring to obtuse tip of the distiphallus in lateral view.

Remarks. The new species is similar to V. fasciata (Meigen) , but it can be separated from the latter by tergites 2–3 with yellowish recumbent scales on anterior half, but scales on tergite 3 less. In V. fasciata , tergites 2 and 3 have yellowish recumbent scales antero-laterally, tergite 4 has yellowish recumbent scales anteriorly.

Figures

FIGURES 1 – 5. Villa wings. 1. Villa aquila sp. nov.; 2. Villa aspros sp. nov.; 3. Villa cingulata Meigen; 4. Villa flavidus sp. nov.; 5. Villa obtusus sp. nov..

FIGURES 30 – 35. Villa obtusus sp. nov. male genitalia. 30. epandrium and cercus, dorsal view; 31. epandrium and cercus, lateral view; 32. gonocoxa and gonostylus, lateral view; 33. phallus, dorsal view; 34. phallus, lateral view; 35. gonocoxa and gonostylus, ventral view.