Rosy maple moth larvae are known as greenstriped mapleworms, and they undergo five instars prior to adulthood, during which their coloration and eating behavior changes. In early instars, the pupa have relatively large black heads and pale yellow-green bodies with faint green stripes. They have two large dark-green to black tubercles on the second thoracic segment and three rows of smaller spines, or setae, on each side of their body. The larvae undergo their first molt around 6–11 days after hatching, their second molt approximately 12 days after hatching, and their third molt around 19 days post hatching. In the next instars, the black head becomes smaller relative to the diameter of the body and the longitudinal stripes darken and become reddish. In later instars, the head becomes yellow, and in the final instar, becomes bright red. By the final instar, the body is yellow green with longitudinal stripes that range from white to green to black. The two prominent horns on the second thoracic segment are accompanied by two rows of short spines found along both sides of the body. At maturity, the caterpillars reach lengths of about 2 inches. Until the fourth instar, the larvae live and feed together, but in their final two instars they are solitary.
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