Delia nigeriposticrus Xue & Du

Du, Jing & Xue, Wanqi, 2018, A review of the Deliainterflua group with descriptions of two new species (Diptera, Anthomyiidae), ZooKeys 764, pp. 145-154 : 148-149

Delia nigeriposticrus Xue & Du sp. n. Figure 2

Type material.

Holotype. China, Yunnan Province, Yulong Snowberg, Big ropeway,4571 m, 29 June 2006, Mingfu Wang Co., ♂(IESNU). Paratype. China, same data as holotype, 2 ♂♂.

Diagnosis.

Frontal vitta almost absent at the narrowest part; pra longer than posterior notopleural seta; both mid femur and hind femur with complete rows of av and pv; sternites V processes with expanded tips, without blunt apical setae; postgonite without setae.

Description.

Holotype male. Body length 5.0-5.2 mm.

Head. Eye bare; frontal vitta black, line form at the narrowest part; frons as wide as anterior ocellus; frontal vitta with 2 pairs of interfrontal setae; without orbital setae; 7 pairs of frontal setae, situated on lower half of frons; fronto-orbital plate and parafacial with fuscous tomentum; parafacial 1.2 times wider than postpedicel; antenna black, postpedicel 1.5-2.0 times longer than broad; arista pubscent, the longest hair shorter than its basal diameter; vibrissal angle situated behind frontal angle in profile; genal height approx. 1/4 eye height; anterior margin of gena with 2 rows of upcurved subvibrissal setulae; postocular setae extending to ventral surface, epicephalon bare; prementum mostly with gray tomentum, 5.0 times longer than broad; palpus short and black, not more than half length of prementum.

Thorax. Black in ground color with brown-gray tomentum; scutum with 3 black vittae, extended to scutoscutellar suture; two rows of hair-like prstacr, only a single pair of post acr developed, dc 2+3, ial 0+2; one pair of weak outer posthumeral setae; pra longer than posterior notopleural seta; scutellum without spots, ventral margins with some pale setae apically; anterior anepisternal setae absent; notopleuron, basisternum of prosternum, anepimeron, meron, and katepimeron bare; both anterior and posterior spiracles small and fuscous; katepisternal seta 1+2.

Wing. Base fuscous, basicosta black; costa setulose only basally on ventral surface; costal spine short; radial node bare, calypters brown yellow; lower calypter approx. 1/3 length of upper one; halter yellow.

Legs. Entirely black; fore tibia with single medial p; mid femur with a complete row of av, becoming shorter apically, a complete row of long and dense pv, becoming longer mediately, 1.8 times as long as its diameter, 1-2 preapical pd;mid tibia with one super-medial pd and two pv; hind femur with complete rows of av and pv, becoming longer apically; hind tibia with a row of av (approx. 9-10), a row of ad (approx. 7-8), a row of pd (three strong) and a complete row of pv, becoming shorter apically; fore tarsus longer than tibia, all claws and pulvilli longer than tarsomere 5.

Abdomen. Black, long flat-shapes in dorsal view (Fig. 2A); all tergites with narrow black vittae in center, lateral surface with dark brown allochroic spot, outer lateral surface with gray tomentum; tergite VI bare; sternite I with dense hairs; sternites V processes with expanded tips. Cercal plate (Fig. 2D) 1.2 times longer than wide, heart-shaped, with narrowly rounded apex; surstyli 2.5 times length of cercal plate, in lateral view (Fig. 2E) strongly bent in basal half; pregonite (Fig. 2H) with 2 setae, postgonite without setae. Aedeagus as Fig. 2 F– 2G; acrophallus longitudinally directed, supported by a sclerotized bridge between the bases of the free paraphallic processes, the sclerotized bridge is prolonged downwards, forming a membranous process.

Female. Unknown.

Remarks.

This new species is similar to D. fulviposticrus Li & Deng, 1981 as it has very similar genitalia, but differs from it for its male body length 5.0-5.2 mm; frontal vitta black; prementum 5.0 times longer than broad; legs black; mid femur with a complete row of av, becoming shorter apically, a complete row of long and dense pv, becoming longer medially, 1.8 times as long as its diameter, 1-2 preapical pd; hind femur with a complete row of pv, becoming longer apically.

Etymology.

The specific name is from the Latin word niger, black, referring to its legs being entirely black which differs from those of Delia fulviposticrus Li & Deng, 1981 which are yellow legs.

Distribution.

China, Yunnan Province (Yulong Snowberg).