[Two new species belonging to Tibetana group of genus Pegohylemyia in China (Diptera: Anthomyiidae)].

Two new species Pegohylemyia tortiforceps and Pegohylemyia ligoniformis were reported in the northwest mountainous areas of Sichuan Province. The former has distorting and pointing surstyli; the latter has the point on the ventral side of the surstyli. The species of Pegohylemyia tibetana group have increased to nine in China; most of them scatter over the Qinghai-Tibet Plateau and the southwest mountainous areas of China; two species are distributed over Japan. The main characteristics of tibetana group are as follows: 5th sternite armed with a row of inclined strong spinous bristles on the base and inner sides; cercal plate resembling a table tennis bat; surstyli with a denticle on the subapical part and aedeagus being membrous trumpet in shape.