none Artificial diets containing hemolymph isolated from larvae of the greater wax month, Galleria mellonella (L.), the oak silkworm, Antheraea pernyi (GuerinMeneville), or the boll weevil, Anthonomus grandis Boheman; from pupae of A. grandis or the tobacco hornworm, Manduca sexta (L.); or eggs of M. sexta supported the in vitro development of the hymenopteran ectoparasitoids, Bracon mellitor Say and Catolaccus grandis (Burks). Developmental time (from egg to adult) for both species was ca. two weeks. Although adult yields obtained with all test diets were very low (20 to 25%), sex ratios, and fecundity and fertility were compared. The high larval and pupal mortalities observed in this study were likely attributable to a series of nondietary factors related to rearing conditions.