none Studies were conducted on the endoparasite Apanteles machaeralis Wilkinson (Hymenoptera: Braconidae) to determine its biology when Diaphania indica (Lepidoptera: Pyralidae) is its host. Eggs were deposited in host larvae and increased greatly in size before hatching. The first instar larva was very active with functional mandibles, whereas the second stage larva was quiescent. The third instar larva spins its cocoon outside the body of the dead host. Mean development time from egg to adult was 12 multiplied by 63 days at 29 multiplied by 25 plus or minus 1 multiplied by 82 degree C and 59-66% RH. There is no preoviposition period. The sex ratio was 1:1 multiplied by 22 (males/females). Mean adult longevity was not significantly different for males (9 multiplied by 31 days) and females (11 multiplied by 68 days).