Abstract
Polynema pratensiphagum (Walley) is an endoparasitoid of mind eggs (CIBC 1979). Walley (1929) found this species fully developed within the eggs of Lygus pratensis L. deposited in common mullein, Verbascum thapsus L., in Ontario. It has been reported from southwestern Quebec as one of the main egg parasitoids of Lygus lineolaris (Palisot de Beauvois) (Sohati et al. 1989). Andrew et al. (1992) have used another mymarid, Anaphes iole Girault, as a biological control agent against Lygus eggs in California strawberry. Little is known of the overwintering behaviour of mymarids because they are very small and difficult to find. No evidence exists in the literature of mymarids overwintering as adults, and we assume that mymarids overwinter as the last larval instar, or prepupa, in host eggs.