The spectrum of parasitoids (namely of Acyrthosiphon pisum Harris and A. gossypii Mordw.) is reviewed with respect to the host range of the particular species. Distribution of parasitoids is analysed with respect to the vertical zonation and corresponding changes in host range and relative abundance of the species. Monoctonus tianshanensis n.sp. (from Amphorophora rubi Kalt. and Impatientinum asiaticum Nevs.) and Aphidius popovi n.sp. (from Amphorophora catharinae Nevs.) are described.