Females lay their eggs singly on pawpaw leaves. They are sometimes laid on the tree trunks. The egg is pale green. After three days it turns an orange-brown color. It turns dark gray just before hatching. The caterpillars are cannibalistic (this means that two individuals of the same species will eat each other). Young caterpillars are black. Older caterpillars have two different color forms. The more common form is green. It has yellow and white stripes. There is a tricolor (meaning it has three colors) band that is bluish-white, black, and yellow. The more rare form is black with white and orange stripes. The caterpillar has a bad smelling, forked gland called an osmeterium. It is found just behind the head. It will use the osmeterium to scare predators. The osmeterium can pull back inside the head when the caterpillar is not using it. The chrysalis is either green or brown. The chrysalis hibernates. It has 1-2 broods per year in the northern part of its range. It has 3-4 broods per year in the southern part of its range.
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