Delia nigerihalteres, Du, Jing & Xue, Wanqi, 2017

Du, Jing & Xue, Wanqi, 2017, Four new species of the genus Delia Robineau-Desvoidy in the Yunnan Province of China (Diptera, Anthomyiidae), ZooKeys 693, pp. 141-153 : 146-147

Delia nigerihalteres sp. n. Figure 3

Type material.

Holotype. China, Yunnan Province, Baimang Snowberg, 4100 m, 30 May 2007, Dandan Wang Co., ♂(IESNU). Paratype. China, same data as holotype, 3♂♂.

Diagnosis.

Frons 1.5 times wider than anterior ocellus; without orbital setae; 6-7 pairs of frontal setae; arista ciliated, longest hair longer to 1.5 times basal diameter; anterior margin of gena with 3-4 rows of upcurved subvibrissal setulae; parafacial 1.2 times wider than antenna; prementum approx. 2.5-3.0 times longer than broad; costa setulose only basally on ventral surface; legs black; mid tarsomere 2 without protuberance; all tergites with broad trapeziform spots in centre, posterior marginal setae and lateral setae strong; inner side of 5th sternite processes without protrusion.

Description.

Holotype male. Body length 3.0-3.5 mm.

Head. Eye bare; frontal vitta black, 1.5 times as wide as fronto-orbital plate; frons 1.5 times wider than anterior ocellus; frontal vitta with a pair of interfrontal setule; without orbital setae; 6-7 pairs of frontal setae, situated on lower 3/5 of frons; fronto-orbital plate and parafacial with dark grey dust; parafacial 1.2 times wider than antenna; antenna black, postpedicel approx. 1.5-1.8 times longer than broad; arista ciliated, longest hair longer to 1.5 times basal diameter; lower facial margin slightly projecting, vibrissal angle situated before frontal angle in profile; genal height approx. 1/5 eye height; anterior margin of gena with 3-4 rows of upcurved subvibrissal setulae; prementum shiny, approx. 2.5-3.0 times longer than broad; palpus black, slightly shorter than prementum.

Thorax. Black in ground colour with brownish grey dust; scutum with three black vittae; two rows of hair-like prst acr (the second pair stronger), only one pair of post acr developed, these situated in front of scutellum, dc 2+3, ial 0+2; notopleural despression bare apart from two strong setae; pra subequal to the posterior notopleural; scutellum bare on disc centrally and basally; katepisternals 1+2.

Wing. Base and veins fuscous, basicosta black; costa setulose only basally on ventral surface; costal spine absent; radial node bare, squamae brown; lower squama approx. 1/2 length of upper; halter black.

Legs. Entirely black; fore tibia with one medial p; mid femur with a complete row of av, becoming shorter apically, a complete row of pv, becoming longer medially; mid tibia with 2-3 pd and two pv; mid tarsomere 1 with row of long pd, subequal to the length of its diameter; hind femur with complete row of av and pv, becoming longer mediately; hind tibia with five av, 5-6 ad, 2-3 pd, and 8-9 pv; all tarsi shorter than tibiae, claws slightly longer than pulvilli, pulvilli approx. 1/2 length of tarsomere 5.

Abdomen. Black, flat cone-shaped in dorsal view; all tergites with broad trapeziform spots in centre, posterior marginal setae and lateral setae strong; 6th tergite bare; 1st sternite with fine hairs.

Female. Unknown.

Remarks.

This new species is similar to Delia quadrilateralis Fan & Zhong in Fan et al., 1981, but differs from it in the following features: male frontal vitta 1.5 times as wide as fronto-orbital plate; frons 1.5 times wider than anterior ocellus; basicosta black; costal spine absent; squamae brown; halter black; mid tarsomere 1 with row of long pd, subequal to the length of its diameter.

Etymology.

The specific name is from the Latin word “niger”, black, “halter”, halter, referring to its black halter.

Distribution.

China, Yunnan Province (Baimang Snowberg).