Autogrupha nigrisigna (INIk.), a serious pest of cabbage and cauliflower was observed recently attacking gram and inflicting heavy losses to this crop for the first time. Under laboratory conditions, the eggs hatched in 3 to 6 days. The larval, prepupal and pupal stages occupied 18-30, 1-3 and 5-13 days, respectively. The pre-and post-oviposition periods lasted for 1-6 and 1-2 days. The adult male life span ranged from 4-5 days and that of female, 7-19 days. The female laid a total of 220-442 eggs in 4-13 days. Total life cycle was completed in 30-52 days.