Cyaforma tonkinensis

Cyaforma tonkinensis (Zia, 1955) (Fig. 7) Ortalotrypeta tonkinensis Zia, 1955: 66. Type-locality: Tonkin, Vietnam. Holotype female in IZCAS.—Zia, 1963a: 637.— Wang, 1988 a: 220.— Norrbom, 1994: 10.— Wang, 1996:115. Diagnosis. Simillar to C. macula (Wang) differing by having only 2 postpronotal setae; scutellum entirely yellow; abdomen predominantly black, with median yellow vitta extending over tergites 1–5; cell r 2+3 entirely dark brown, lacking hyaline spot; cell m almost completely dark brown except for very small hyaline indentation on posterior margin of wing; cell dm with large hyaline streak. Description (male). Not sexually dimorphic. Male epandrium rounded in posterior view, lateral surstylus with apex rounded in lateral view, medial surstylus having 2 black and different-sized prensisetae; distiphallus membranous basally, well sclerotized apically. Distribution. China (Yunnan, Guizhou, Sichuan); Vietnam (Tonkin). This species is newly recorded from China. Material examined. Holotype ♀, VIETNAM: Tonkin, 10–13.VII.1934, E. R.Tinkham (IZCAS). Other material: 1 ♂, CHINA: Sichuan: Chong qing, Nan chuan, Jinfoshan, 24–28.VII. 2003, Caixia Yuan and Yushuang Liu (HBU, No. 21013-5-21); 1♀, Guizhou, Daozhen, Dashahe, 17–21.VIII.2004, Xiujuan Yang and Huiran Hua (HBU); 1♀, Yunnan, Maguan, Gulinjing, 20.VII. 2006, Benyong Mao (HBU, No. 21013-5-21); 1 ♂, Yunnan, Shizong, Junzishan, 16.VII.2006, Benyong Mao (HBU, No. 21013-5-21); 3 ♂, Yunnan, Kunming, Xishan, 21.IX.2018, Yong Wang (IZCAS). Biology. Flies of this species (Fig. 7 A–D) were observed in Xishan, Kunming, Yunnan Province, China by Yong Wang in the autumn of 2018. The climate there was damp and foggy. The collection site was located at the top of Xishan Mountain on a roadside. One side of the road was very close to a dense forest. The flies were found and collected on leaves of an invasive plant, Ageratina adenophora, where sugar water had been sprayed on leaves. So, it was assumed that the flies had been lured from the forest beside the road by the sugar water.