Drymeia pilifemorata Xue and Wang, sp. nov.

(Figs. 29–33)

Description

Male. Body length 5.5–6.0 mm. Head: Eye bare; frons about 1.5–2.0 times as wide as anterior ocellus; frontal vitta black, its narrowest part equal to or narrower than one fronto-orbital plate; frontal setae 9–11, the longest seta extending to anterior ocellus, with thin hairs among them; with a pair of ocellar setae, without interfrontal setae and orbital seta; fronto-orbital plate and parafacial with greyish pruinosity; parafacial about 1.3 times as wide as 1st flagellomere; antenna black, 1st flagellomere about 1.5 times as long as wide, arista ciliated, the longest aristal hairs slightly longer than its basal diameter; facial carina developed; epistoma protruding over frontal angle in profile; gena black, with 3–4 rows of upcurved subvibrissal setulae, genal height about 1/5 of eye height; dorsal area of occiput with hairs; proboscis thin and long, with grey pruinosity, prementum about 4.0 times as long as broad; palpus black, slightly shorter than the length of prementum, labella enlarged in lower part.

Thorax: Ground color black, with dense grey pruinosity; scutum with four indistinct vittae, with 2 rows of presutural acr, 1–2 pairs strong among them, postsutural acr 1, dc 2+3, ia 0+2, pra strong, about 2/3 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. Brown, wing base and veins dark brown; basicosta black, costal spine short and small, Sc straight; dorsal and ventral surfaces of radial node bare, m-m crossvein slightly S-shaped, R4+5 and M veins parallel, more or less separated distally; calypters yellowish; halter black.

Legs. Entirely black; fore tibia with 2 pv in the middle; mid femur with a complete av row, which becomes bigger towards apical part, with long hair-like pv in basal half; mid tibia without ad, 4–5 pd, 3–4 pv; hind femur with a complete row of av and pv, pv hair-like; hind tibia with 1–2 short av, 2 ad, 4–5 pd, 2–3 hairlike pv, with a distinct apical ventral projection that has 1 short seta on it; all tarsi longer than tibiae, fore claws short, about 1/2 length of pulvilli, hind claws slightly longer than pulvilli.

Abdomen. Black, egg-shaped, all tergites with dense brownish-grey pruinosity, black median vittae of all tergites becoming narrower towards posterior margin, all tergites with setigerous spots around the base of setae, sternite 1 bare; outboard processes of cerci indistinct, cerci only slightly concave in posterior view, with small pointed processes medially, distal 1/3 broad in posterior view; processes on inner margin of surstylus sharply pointed in the middle in lateral view.

Female. Unknown.

Type material

Holotype, male, P.R. CHINA: Tibet, Jiangda, 3400 m, 21.vii.1976 (Yin-heng Han). Paratype, P.R. CHINA: 4 males, 1 female, the same data as holotype, 1 male, Tibet, Chaya, Jingtangjiuxi, 3600 m, 17.vii.1976, (Yin-heng Han), 2 males, Qinghai, Yushu County, 3750 m, 12.vi.1964 (Shu-yong Wang).

The specimens are deposited in the Chinese Academy of Sciences, Beijing, China.

Remarks

This species resembles Drymeia xinjiangensis (Qian and Fan), but differs from it in the wider parafacial; arista ciliated, and the longest setae distinctly more than diameter of aristal base, mid femur with a row of long hairs in basal 1/3 of posterior ventral surface; hind femur with a row of fringe-like long hairs in basal half of posterior ventral surface; hind tibia with 4–5 erect and slender pv on 1/3 basal part of ventral surface.

Etymology

The species name is from the Latin words pil- meaning hairs and femorata meaning femur, referring to male hind femur with a row of fringe-like long hairs in basal half of posterior ventral surface.