Household Casebearer or Plaster Bagworm

Typically found indoors in warm, humid climates, often on walls, in corners of rooms, or underneath furniture (especially near spider webs).

Feeds on old spider webs, accumulation of dust, lint, woolen fibers, and insect debris.

The larva constructs a distinctive flattened, pumpkin-seed-shaped case out of silk and debris (sand, soil, frass), which it carries around for protection. It drags this case along surfaces as it searches for food.

Generally harmless to humans and pets; they do not sting or bite. However, they can be a minor nuisance pest in homes. They may occasionally damage woolens or fibers, similar to clothes moths, but usually feed on debris.