Abstract: The acceptability and suitability of eggs of five predatory insects to parasitization by Trichogramma were observed under no choice and choice situations in the laboratory. The results from no choice experiments showed that both T. dendrolimi and T. chilonis could parasitize and emerge from Chrysoperla nipponensis and Chrysopa pallens, but could not parasitize Propylaea japonica, Harmonia axyridis and Coccinella septempunctata. In choice experiments, T. dendrolimi substantially preferred eggs of C. nipponensis to the target host Ostrinia furnacalis as indicated by both number of contact with host eggs and the number of eggs laid in the hosts. Trichogramma chilonis also contacted and parasitized more eggs of C. nipponensis than eggs of the target host Helicoverpa armigera, but the difference was not significant. In both parasitoids, there was no significant difference in number of offspring wasps per host egg and sex ratio, and percentages of parasitizing wasps between target hosts and C. nipponensis.