A study was undertaken to measure the duration of different developmental stages and other related parameters of B. hebetor reared on the larvae of G. mellonella. The biology of the ecto-endo larval parasitoid, Bracon hebetor (Say), was studied on the wax moth, Galleria mellonella (F.) larva at 25±2°C, 75±5% RH and 12 hr photoperiod. The mean incubation period was 1.48 days and larval period 3.17 days. The pupal period lasted for 4.35 days with a range from 4.0 - 6.0 days. The mean development period of the parasitoid on G. mellonella was 9.60 days. The females lived longer period (20.00 days) than males (14.40 days). [ABSTRACT FROM AUTHOR]