Polistes exclamans arizonensisSnelling was successfully overwintered in a cage provided with stacks of cardboard interspersed with spacers. When the wasps emerged in the spring they readily nested in a 1.2×1.8×1.2-m shelter with screen on 3 sides. The wasps were fed 4th- to 6th-stage larvae of the tobacco budworm,Heliothis virescens(F.), and provided with kraft paper torn into small bits for nesting material. A mean of 5.3 budworm larvae was rcquired for nutrition of each wasp.