Household Casebearer (or Plaster Bagworm)

Typically found indoors in dry, dusty environments. Common on walls, in closets, under furniture, or in spider webs found in garages and basements.

Larvae feed on detritus, including spider webs, old insect skins, wool, animal hair, and lint. They are detritivores.

The larva constructs a flat, pumpkin-seed-shaped protective case from silk, sand, and debris, which it carries around. It can extend its head from either end of the case to move or feed.

Generally harmless to humans (does not bite or sting). Can be a minor pest to wool clothing or rugs, but mostly considered a nuisance pest due to their appearance on walls.