Mimallonidae is a small family, with about 200 members worldwide. Most are Neotropical, while two species are found in eastern North America, and one in western North America.
These moths have a stout, often furry-looking body, and tend to be of medium size. The frenulum is small or vestigial.
The common name, sack-bearer, refers to the habits of the caterpillars, which in the later instars construct a bag made of leaves bound with silk. This becomes their "sleeping bag" used to pass the winter. Pupation occurs in the spring.
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