Northern Prairie Wildlife Research Center
Dorsum blackish above and sides either orange or black with orange spot below and anterior to each white spiracle. Raised setal warts on first and eighth abdominal segments. Dorsal tufts orange on second and third thoracic and first abdominal segments; tufts of abdomen and sides white; and dorsum of eighth abdominal segment with numerous darker setae. Long pale hairs extend from either end of body. Food: alders, birches, poplars, willows, and many other broadleaf shrubs and trees. Caterpillar: May to October; 2 or more generations in South, 1 in North.