Northern Prairie Wildlife Research Center
Glaucous to (rarely) blackish green with creamy stripes and spots. Eighth abdominal segment slightly swollen and humped as in other Orthosia species. Middorsal stripe continuous, subdorsal interrupted. Spiracular stripe somewhat thickened, passing below first and last, but above all other spiracles. Head evenly green, or less commonly, with some reticulation. Food: many shrubs and trees, including softwoods. Caterpillar: May to June; 1 generation.