Northern Prairie Wildlife Research Center
Bright green, elongate and somewhat flattened dorsally with reduced prolegs on third abdominal segment. Head green, occasionally with setal bases darkened. Setal bases orange, red, or black. Setae on eighth and ninth abdominal segments twice length of those midabdominal segments. Rear of each segment yellowed. Anal prolegs splayed out in V. Food: maples. Caterpillar: June to November; 2 or more generations in South, 2 in North.