from About.com: Insects: Satin Moths:The Eurasian native Satin Moth, Leucoma salicis, was introduced to North America accidentally in the early 1920s. The original populations in New England and British Columbia gradually spread inland, but predation and parasites seem to be keeping this insect pest largely under control. Satin Moths feed on poplar, aspen, cottonwood, and willow.
The Satin Moth has a unique life cycle with one generation each year. Adult moths mate and lay eggs in the summer months, and caterpillars hatch from those eggs in the late summer and early fall. The tiny caterpillars feed for a short time before they hide in a bark crevice and spin a web for hibernation. The Satin Moth then overwinters in the caterpillar form, an unusual way to survive the cold. In spring, they re-emerge and feed again, this time reaching their full size of nearly 2 inches before pupating in June.
This individual was on my porch screen on Friday night.
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