Northern Prairie Wildlife Research Center
Unique caterpillar with horned head, arched third thoracic segment, and attenuated "tail." Orange- to chocolate-brown body vested with minute spinules, with vague saddle over dorsum, which narrows over fourth abdominal segment. Head with prominent thorny projection to either side. Anal plate very elongate and spined, held tail-like behind body. Food: viburnums. Caterpillar: July to October, 2 generations.