Delia longiabdomina, 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 : 143-145

Delia longiabdomina sp. n. Figure 2

Type material.

Holotype. China, Yunnan Province, Yulong Snowberg, 4506 m, 29 June 2006, Baifeng Wang Co., ♂ (IESNU). Paratypes. China, same data as holotype, 1 ♀ and 4♂♂(IESNU); China, Yunnan Province, Yulong Snowberg, 4506-4571 m, 29 June 2006, You Wang Co., 5♂♂ (IESNU); China, Yunnan Province, Yulong Snowberg, Big ropeway, 4571 m, 29 June 2006, Mingfu Wang Co., 3♂♂(IESNU).

Diagnosis.

Arista pubescence, longest hairs shorter than its basal diameter; lower facial margin slightly projecting, situated before frontal angle in profile; legs black; hind tibia with one row of pv; inner side of 5th sternite processes with a protrusion.

Description.

Holotype Male. Body length 6.5 mm.

Head. Eye sparsely with short ciliated; frontal vitta black, with black dust; frontal vitta with a pair of interfrontal setule; frons as wide as anterior ocellus; without or bital setae; fronto-orbital plate with dark grey dust; 6-7 pairs of frontal setae, situated on lower half of frons; parafacial 1.5 times wider than postpedicel; antenna black, postpedicel approx. 1.5-1.8 times longer than broad; arista pubescence, longest hairs shorter than its basal diameter; lower facial margin slightly projecting, situated before frontal angle in profile; gena sparsely with dark grey dust, genal height approx. 1/5 eye height; anterior margin of gena with 1-2 rows of upcurved subvibrissal setulae; para-occipital and postgenal hairs black; proboscis slender, prementum with grey dust, 6.0 times longer than broad; palpus black, subequal to prementum.

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

Wing. Base fuscous, basicosta black; costa setulose only basally on ventral surface; costal spine subequal to crossvein r-m; radial node bare, squamae yellowish or white, outer marginal hairs long; lower squama short, approx. 1/2 length of upper; halter brownish yellow.

Legs. Entirely black; fore tibia with one medial p; mid femur with seta-like a row in basal half, pv rows complete, becoming shorter apically; mid tibia with two p, one long pd and 1-2 short pv; mid tarsomere 1 with one row of long pd, longer than its diameter; hind femur with complete row of av, becoming longer apically, with two apical pv; hind tibia with 8-10 av, 5-6 ad, one row of pd (4 developed), and one row of pv, similar as Delia platura (Meigen, 1826); all tarsi shorter than tibiae, claws and pulvilli large.

Abdomen. Black, long flat-shaped in dorsal view, with grey dust; all tergites with broad black vittae in middle part, the front margin slightly dark, edge unclear; lateral and post marginal setae long; 6th tergite bare; 1st sternite densely with long setae; 3rd and 4th sternites without dense long setae.

Female. Body length 5.0-5.5 mm; frons approx. 2/5 width of head; frontal vitta 2.5 times as wide as fronto-orbital plate; three pairs of orbital setae and three pairs of frontal setae; genal height 1/3 eye height; dc 2(3)+3, without outer posthumeral setae; katepisternum 1+1(2); fore tibia with 1-2 ad; hind tibia with 4-5 av, 5 ad, 7-8 pv; the other characters as same as male.

Remarks.

This new species is similar to Delia subnigribasis Fan & Wang in Fan et al., 1981, but differs from it in the following features: male frontal setae 6-7 pairs; pra subequal to posterior notopleural seta; inner side of 5th sternite processes broad apically; cercus broad apically, surstylus broad and straight in dorsal view, straight in lateral view, becoming slender apically.

Etymology.

The species name is derived from the Latin words “long” meaning long, referring to its very long abdomen.

Distribution.

China, Yunnan Province (Yulong Snowberg).