none Studies on Cotesia orientalis Chalikwar et al., (Hymenoptera: Braconidae), larval parasitoid of Exelastis atomosa Fab. (Lepidoptera: Pterophoridae) were carried out at laboratory conditions (24 plus or minus 1 degree C, 55-60%, RH). The mated female had an average 8.4 days ovipositional period and produced an average 91.1 adults with sex ratio 1.289:1 (m : f). The maximum mean progeny production per day "m sub(x)" was 11.7. The intrinsic rate of increase was 0.188 per female per day and population multiplied to 41.93 times in mean generation time of 19.87 days.