Northern Prairie Wildlife Research Center
Reddish to gray brown with subventral fringe of short thick setae. Distinguished from other loopers by its extra pair of (reduced) prolegs on fifth abdominal segment. Head with diffuse dark band from eyes to vertex. Dorsum of eighth abdominal segment with small warts. Food: many forest trees, especially maples. Caterpillar: June to November; 2 generations in North.