Chinese species of the genus Aptesis Förster (Hymenoptera, Ichneumonidae) parasitizing sawflies, with descriptions of three new species and a key to species.

Six species of the genus Aptesis Förster 1850 belonging to the tribe Hemigastrini of the subfamily Cryptinae (Hymenoptera, Ichneumonidae) are reported from China. Three of them, Aptesis elongata Li & Sheng, sp. n., Aptesis melana Li & Sheng, sp. n. and Aptesis nigricoxa Li & Sheng, sp. n. reared from sawflies in China, are new to science. The biology of Aptesis melana is described. A key to the species of Aptesis known from China is provided.