Northern Prairie Wildlife Research Center
Charcoal black with orange-yellow stripes that fade appreciably in prepupal individuals. Head black. Second thoracic segment with long, black spinulose horns. Abdominal spines relatively small. Gregarious in early instars, then solitary. Occasionally reaches outbreak densities. One related species occurs in southern Ontario, and another in Florida and Georgia. Food: oaks and chestnuts. Caterpillar: August to October; 1 generation.