Females can be twice as large as males, and more variable.
Postmedian line on forewing is narrower than that of Anisota stigma , and postmedian line on hindwing is very faint or lacking. At dusk the females lay eggs in large groups on the underside of oak leaves. Young caterpillars are gregarious but become solitary as they grow. Fully-grown caterpillars pupate and overwinter in shallow underground burrows. One brood from July-September.