Northern Prairie Wildlife Research Center
Green, granulose, marked with yellow; often with wine red markings subdorsally, about spiracle and above prolegs. Subdorsal line on thorax absent. Head triangular, green, with or without faint band running to vertex. Horn nearly straight, sometimes shortened, very granulose, usually green and unmarked. Food: many forest trees, especially cherries. Caterpillar: June to November; evidently just 1 generation.