Fall webworms come in two distinct forms, known as biotypes, which are named for the color of the caterpillar's head capsule: black-headed and red-headed. Caterpillars of both types are very hairy, but differ in body coloration, nesting behavior, dates for spring adult emergence, and to some extent, host preferences. Indeed, some entomologists are proposing that these biotypes should be considered different species or perhaps subspecies.
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