Northern Prairie Wildlife Research Center
Smoky green with inconspicuous striping. Head with deep green triangle and broad black bands on both sides. Faint middorsal stripe edged with white. Subdorsal stripe white above, dark below, continued onto head; whitish spiracular stripe. Darkened line above proleg. Several other angles feed on conifers in East. Food: hemlocks. Caterpillar: June to October; 2 generations in North.