Northern Prairie Wildlife Research Center
Generally dark above and becoming more mottled with red to venter. Dorsum of thorax and first abdominal segment with raised reddish warts, those of abdomen set with mostly stiff black setae. Pink to creamy dorsal patches on second to eighth abdominal segments; warts on these segments pale above spiracles and red belowboth giving rise to mostly white setae. Red subspiracular stripe runs length of abdomen. Food: alders, birches, cherries, oaks, and others. Caterpillar: May to October; 1 generation in North.