Plaster bagworm (household casebearer)

Dry, sheltered indoor areas such as walls, ceilings, closets, bathrooms, and beneath furniture, especially where spider webs or lint accumulate.

Larvae consume spiderweb fragments, wool, fur, hair, dead insects, and other keratin-containing debris; adults generally do not feed.

The larva lives inside a portable silken, lint-covered case and crawls while partly concealed. It pupates within the case; adults are small, brownish moths and are weak fliers.

Harmless to people and pets and does not bite or sting. It may damage wool or other animal-fiber textiles and indicates accumulated lint, webs, or humidity; vacuuming and reducing moisture usually control it.