Based on analysis of fecal pellets, June bugs, Scarabaeidae, were the most abundant food of a colony of big brown bats, Eptesicus fuscus, from Morrow, GA, forming 36.9% of the food overall. They were eaten heavily early in spring and less so in late summer and fall. Ground beetles, Carabidae, were the second most abundant food item (12.1% of the diet overall). Beetles, collectively, made up 57.7% of the sample, followed by hymenopterans (10.7%; composed primarily of Formicidae), dipterans (10.5%), homopterans (8.8%), and hemipterans (5.0%). Lepidopterans made up 2.8% of the diet.