Abstract: In this paper, Sphecia siningensis n. sp. (figs. 1—7) from Qinghai province of China is described.This species closely resembles S. oberthiiri Le Cerf, but may esily be distinguished from it in the following characters:hairs on vertex of the male almost cinereous, posterior hairs on vertex of the female cinereous. Metathorax thickly with green-yellow hairs. Tergum of the 3rd abodominal segment with broader yellow band, no narrow erythroic margin. The ventral side of the abdo-minal segment yellow, with cinereous margins to each segment. The genitalia is as shown in figs. 5—7.Holotype: ♀, Sining, 1978. Ⅷ. 15; Allotype: ♂, Sining, 1978. Ⅷ. 15; Paratype:16♂♂, 19♀♀, Sining. The specimens are deposited in the insect collection of the Forest Research Institute, Qinghai Academy of Agriculture and Forestry.