Northern Prairie Wildlife Research Center
Whitish, vinaceous, or yellowish green spangled with small white spots; sides with prominent maroon to brown spot above each spiracle; as shown here. Last instar more green-brown with less conspicuous spotting. Head shiny orange-brown. Middorsal line thin, white; subdorsal, spiracular and subspiracular lines somewhat thicker, wavy. Paler green beneath subspiracular stripe. Resting within leaf shelter by day. Food: many broadleaf trees and shrubs. Caterpillar: May to July; 1 generation.