none Chelonus insularis Cresson, a solitary, primary, egg-larval endoparasite of several species of the genus Spodoptera and Heliothis and was studied under laboratory conditions of 25 +- 2 degree C and 65 +- 5% H.R. The egg are elongated and translucent white, the chorion is bland, smooth and transparent (tipically hymenopteriform). There are 3 instars; the 1st. is mandibulate and the other two hymenoptriforms; the 3rd, instar larvae emerged from the host larvae, consuming it, and spin a silver-white cocoon. The time from egg to adult was about 29,05 days, averaged. The females lived 25,52 days and the males 22,1 days, when feed with honey been and water; without honey, the mean longevity was 5,6 days. The females are provigenics. The sex ratio was 1:1,89 (tau: male ). The daily percentages of parasitization was different between 20 females studied, consequently to be could not stablish a ranged live during which the females obtaining high levels of daily parasitization. The progeny obtained for female depend on the number of eggs exposed daily, obtaining a progeny of 900 individuals for female, when exposed 80-90 eggs for day. Chelonus insularis did not emerge from larvae of S. frugiperda having head capsule width greater than 1,6 mm.