Northern Prairie Wildlife Research Center
Coloration regionally variable, often yellow to gray brown with posterior pair of black "lashes" sparse or absent. No whitish setae. Middorsum of first and eighth abdominal segments with enlarged black tufts; those on second, third, and fourth abdominal segments weakly differentiated. Food: especially oaks but also many other forest trees and shrubs. Caterpillar: September to June; 1 generation.