Northern Prairie Wildlife Research Center
Green with whitish markings, closely mimicking leaves of cedar hosts. Head with pale areas to either side of deep green triangle. Inconspicuous darkened middorsal stripe, broken white subdorsal stripe, and broken greenish or yellowish white spiracular stripe. Spiracular areas of abdomen raised. Another cedar feeder, many-lined angle (S. multilinea), tends to have subdorsal stripe broken up into spots that are broadest above spiracle. Food: junipers. Caterpillar: May to November; 2 generations in North.