Drymeia spinicosta Xue and Xiang

Xue, Wan-Qi, Wang, Dan-Dan, Zhang, Xue-Zhong & Xiang, Chao-Qun, 2007, Five new species of Drymeia Meigen from the Tibet Plateau, China (Diptera: Muscidae), Zootaxa 1444, pp. 35-51 : 46-48

Drymeia spinicosta Xue and Xiang , sp. nov.

( Figs. 22–28 )

Description

Male. Body length 6.2–6.5 mm. Head: Eye bare; frons about 2.5–3.0 times as wide as anterior ocellus or narrower than the distance between outer margins of posterior ocelli; frontal vitta black, narrow in the middle, about 1/3–1/2 width of fronto-orbital plate; 8–10 frontal setae, the longest seta extending to anterior ocellus, without orbital seta; fronto-orbital plate and parafacial with grayish-white pruinosity; parafacial about 1.5 times as wide as 1st flagellomere; antenna black, 1st flagellomere about 1.5–1.8 times as long as wide, arista ciliated, the longest aristal hairs equal to its basal diameter; epistoma protruding over vibrissal angle in profile, vibrissal angle noticeably situated behind frontal angle in profile also; gena black, with grey pruinosity, and with 3–4 rows of upcurved subvibrissal setulae, genal height about 2/9 of eye height, dorsal area of occiput with hairs; proboscis thin and long, prementum shiny, about 4.0–4.5 times as long as broad; palpus blackish-brown, shorter than the length of prementum.

Thorax. Ground color black, with olive green metallic luster; with slight brown pruinosity, scutum with four indistinct vittae, with 2 rows of hair-like presutural acr, postsutural acr 1, dc 2+3, ia 0+2, pra slightly shorter than the length of posterior notopleural seta; notopleuron with hairs; lateral and ventral margins of scutellum, basisternum of prosternum, anepimeron, meron and katepimeron all bare; katepisternal setae 1+2.

Wing. Light brown, slightly hyaline; wing base and veins brown, basicosta black, costal spine developed and longer than length of r-m crossvein, Sc straight; R4+5 and M veins parallel, more or less separated distally; m-m crossvein curved in the middle, veins bare except dorsal surface of C vein with distinct short spine; calypters brown, margins brown, halter dark brown.

Legs. Entirely black; fore tibia with a row of small ad, 3 pv in the middle; mid femur with complete av and pv rows, which become shorter towards apex, mid tibia with 4–5 av, 3–4 ad, a row of about 5–6 p, and 4– 5 pv; hind femur with a complete av row, and about 9–10 setae in pv row thin and long, which become shorter towards apex, without median p; hind tibia with 6–7 av, 1 thin pv row, ad row irregular and with 3–4 longer and stronger setae in the row; with 5–6 pd; without apical ventral projection; claws and pulvilli of all legs longer than 5th tarsomere.

Abdomen. Black, long and egg-shaped, with olive green metallic luster and with grey pruinosity, all tergites with indistinct lateral patch, posterior marginal setae long and large, sternite 1 bare; outboard processes of cerci very blunt and distal 1/3 broad in posterior view; processes on inner margin of surstylus pointed in the middle in lateral view.

Female. Body length 6.5–7.5 mm. Frons about 1/3 width of head; frontal vitta about 2.5 times as wide as fronto-orbital plate, with long and large interfrontal setae, with 5–6 pairs of orbital setae, 2 outer orbital setae and 1 reclinate orbital setae, with 2 rows of upcurved subvibrissal setulae, genal height about 1/3 of eye height, margins of calypters brown; fore tibia with 2–3 av; mid femur with complete av and pv rows, becoming shorter towards apex; mid tibia with 4–5 av, 3–4 ad, a row of about 5–6 p, 4–5 pv; hind femur with a complete av row, pv row thin and long (about 9–10), shorter towards apex, without apical pv; hind tibia without distinct pv, with 4 pd; 3 spermathecae, ovipositor thin and long, both tergite 8 and sternite 8 divided into 2 parts, each enlarged terminally, and with 5–6 strong spines on them.

Type material

Holotype, male, P.R. CHINA: Qinghai, Yushu County, Batang, 3900–4300 m, 16–22.vi.1964 (Shu-yong Wang).

Paratypes, P.R. CHINA: 10 males, 11 females, the same data as holotype. Allotype, P.R. CHINA: 1 female, same data as holotype. The specimens are deposited in the Chinese Academy of Sciences, Beijing, China

Remarks

This species is close to Drymeia aeneoventrosa (Fan, Jin and Wu) , but differs from it by the presence of a conspicuous row of comb-like spines on C vein, with 1 strong pra, notopleuron with hairs, calypters brown or yellowish, different from color of their margins, mid femur with a complete row of av.

Etymology

The species name is from the Latin words spin- meaning spine and costa meaning brim, referring to the anterior margin of C vein in the male that has a conspicuous row of comb-like spines.

Figures

FIGURES 22 – 28. Drymeia spinicosta Xue and Xiang, sp. nov. (male and female).?: 22. Wing in anterior view. 23. Sternite 5 in ventral view. 24. Cerci in posterior view. 25. Terminalia in profile view.?: 26. Sternites 1 – 5. 27. Ovipositor in dorsal and ventral views. 28. Spermatheca.