Two species of encyrtid (Hymenoptera: Encyrtidae) were reared from nymphs and female adults of Antonina graminis (Maskell) and Pseudococcus longispinus (Targioni Tozzetti) (Homoptera: Pseudococcidae) respectively, in Taiwan. Among them, Anagyrus thailandicus (Myartseva) is recorded in Taiwan for the first time. Cryptanusia taiwanus Chen and Chen sp. n. is new to science. A. thailandicus is listed with figures, and the new species is described and illustrated with figures.