Northern Prairie Wildlife Research Center
Dusky gray or brown with pale addorsal and subdorsal stripes, and abundant short white setae. Head chestnut brown with strong black mottling, often absent over vertex and posterior to eyes. Sides with 2 or 3 pale wavy stripes. Some setae borne on yellow to orange warts, these more evident over dorsum. Dorsal black tufts of other Clostera absent. Food: willows and poplars. Caterpillar: August to September; 1 generation in North.