Gregarious and quasi-gregarious parasitoid females can either mate on the emergence patch or disperse and mate later. The temporal pattern of dispersion of males and females and the level of predispersal mating for females were measured in three egg parasitoid species: Trichogramma evanescens Westwood, Trichogramma minutum Riley, and Trichogramma pintoi Voegele (Hymenoptera: Trichogrammatidae). Results showed that T. minutum has a higher proportion of virgin females in the dispersing population than T. pintoi and T. evanescens. However, the fact that a proportion of dispersing virgin females was found in all three species indicates some level of genetic exchanges between subpopulations of these egg parasitoids. Results suggest that all species can show partial local mating at different levels.