none Biological and behavioral aspects of four main species of boll weevil, Anthonomus grandis Boh. hymenopteran ectoparasitoids, occurring in the Campinas region, state of Sao Paulo, Brazil, were studied under laboratory conditions. Bracon vulgaris Ashmead (Hymenoptera, Braconidae) showed to be easily adapted to artificial rearing conditions. Females oviposited an average of 2.08 eggs/host; egg incubation period varied from 24 to 36 hours; larvae passed through four instars and completed their development in 4.0 days; the same duration time was observed for pupal stage. The longevity of mated adults was in average 41.11 days for females and 31.72 days for males. Last instar larvae of Plodia interpunctella (Hueb.) (Lepidoptera, Pyralidae) were used with success as alternative host, in the absence of A. grandis, during the winter. Informations about three other parasitoids species, Bracon sp., Cataloccus grandis (Burks) (Hymenoptera, Pteromalidae) e Eupelmus cushmani (Hymenoptera, Eupelmidae) are also presented.