Acidiostigma tongmaiense Chen, sp. nov.

(Figs 35–40)

Diagnosis. The wing pattern of this species resembles A. amoenum Wang, differing from it in cell c partly yellow with 2 hyaline spots, 1 narrow black band continuously over the middle of cell r1 and cell r2+3; the black mark in cell dm situated at the posterior part.

Female. Head (Fig 36, 37). Predominantly yellow to yellow-brown, frons slightly darker; 3 pairs of frontal and 2 pairs of orbital setae; ocellars moderately developed, almost same length as posterior orbitals. The 1st flagellomere rounded at apex; arista pubescent. Thorax (Fig 39). Entirely yellow-brown with 4 vague broad yellow to brown vittae on scutum, a vague pale yellow stripe extending from postpronotal lobe along upper margin of anepisternum to wing base; mediotergite yellow-brown. Body setae black, dorsocentral setae situated behind line of postsutural supra-alars. Legs (Fig 35). Entirely yellow, fore femora each with 5–6 posteroventral setae; mid tibia with 1 strong apical spur. Wings (Fig 40). The pattern is not Hemilea -like; cells bc and c largely yellow and with 2 vague hyaline spots in cell c; cell sc entirely dark brown, subequal in length to cell c; one broad dark brown band extending from cell sc, over crossvein R-M and posterior part of cell dm to cell cu1; 1 narrow dark brown band continuously over the middle of cell r1 and cell r2+3; having 2 distinct hyaline spots in apical mark; lobe of cell bcu short; vein R4+5 setose slightly over crossvein R-M, the latter situated well beyond the middle of cell dm. Abdomen (Fig 38). Tergites 1–3 reddish brown to dark brown, tergites 4–6 brown to black, each tergites with narrow yellow band on posterior margin; oviscape black and flattened, about the length of tergites 4–6.

Length. Body, 9.0 mm; wing, 9.1 mm.

Male. Unknown.

Distribution. China (Xizang).

Type material. Holotype ♀, CHINA: Xizang, Tongmai, Pailong, 30º 01.146N, 95º00.046′E, 2049–2081 m, 31August 2005, X-L Chen (IZCAS).

Etymology. The specific epithet is derived from Tongmai, the type locality.