西藏毛蚜蝇雄性记述

Description of Male Dasysyrphus xizangensis Pan,Wang et Huo,2010

本文记述了西藏毛蚜蝇Dasysyrphus xizangensis Pan,Wang et Huo,2010雄性特征。雄性体色及身体大小类似雌性,但雌性离眼,雄性合眼。该种模式标本保存于陕西理工大学动植物标本馆。

Dasysyrphus xizangensis was described by Pan et al. in 2010 from Xizang Autonomous Region with the male unknown. The specimens of male and female were collected from Shanxi province in 2015. This paper supplemented the de- scriptions and illustrations of the male. The examined specimens were deposited at Shaanxi Sci-Tech University, Hanzhong city, Shaanxi province, China. The appearance D. xizangensis Pan, Wang et Huo, 2010 was similar to Dasysyrphus post- claviger （Stys et Moucha, 1962）, however, the former had dark-brown stigma and yellow hind tarsi, while the latter had yellow stigma and black hind tarsi. The eyes of D. xizangensis were covered with densely yellowish brown hairs. Face yellow with black median stripe not extending to base of antennae. Mesonotum was covered with yellow long pile, shining black with dark gray median stripe extending posteriorly almost to the end of mesonotum. Scutellum yellow, mostly black pilose. Legs were brownish yellow, but dark black on all of coxae, trochanters and basal portions of femora. Wing stigma was black- ish brown. Abdomen shining black, 3 pairs of yellow spots on abdomen were not extended to margins. The first pair of spots were obliquely located in the middle of tergite 2, with inner ends nearly approaching anterior margin of the tergite. The sec- ond and third pairs of spots were located in basal half of tergites and with expanded outer ends triangularly. Tergites 4 and 5 were narrowly yellow on posterior margins. Male terminalia was similar to that of D. postclaviger, but differed from the latter by distal portion of aedeagus inflated medially （compared with figures 281 -284 of Hippa, 1968, P. 73）.