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The rosy maple moth has a variable coloration. In most cases, it is white, yellow, or cream-colored, with some amount of pink at the outer and inner portions of the wings.
Adults emerge in the late afternoon and mate in the late evening. Females begin laying eggs at dusk the next day in groups of 10-30 on leaves of the host plant. Eggs hatch in about 2 weeks and feed gregariously when young. Older caterpillars feed alone. Fully-grown caterpillars pupate and overwinter in shallow underground chambers.
Larvae are greenish white with an orangish-brown head. There are two elongated black horns on the second thoracic segment (the second segment behind the head). A ring of tiny black spines encircles each abdominal segment; the ones on the top and sides are very short, but the ones lowest on the sides are longer. Spines on the hind end of the caterpillar are longer. Sometimes there is a pinkish-red patch on each side of the hind end (abdominal segments 7 and 8). In some stages, lengthwise stripes run down the body.
Range: Nova Scotia west through Quebec to Ontario and Minnesota; south to Dade County, Florida, the Gulf Coast, and east Texas.