Behavior
Females lay pale yellow eggs in clusters of 20-30 on the undersides of maple leaves. After about two weeks, small gregarious caterpillars hatch. They will remain gregarious through the third instar, but the final two are solitary. The mature larvae are light green with black lateral lines, red heads, and two filaments behind the head, and reach lengths of about 55 mm. When they are ready, they climb to the bottom of the host tree and pupate in shallow underground chambers. The pupae are very dark, elongated, and have small spines. The pupa ends in a small forked point. When the imago ecloses, it has small wings which it has to pump full of fluid in order for them to expand and allow for flight. Adult moths are generally nocturnal; they preferentially fly throughout the first third of the night . The females emit pheromones at night and attract males, which have bushier antennae to detect the pheromones.References:
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