Larger than subterranean termites, up to one-half inch long; no worker caste in the colony.
Create colonies in wood, with no connection to the ground necessary; often found in attic wood; need very little moisture.
Wood and occasionally other cellulose material.
Nymphs pass through seven instars before reaching adulthood; sexual forms eventually swarm to form new colony.
Cause serious damage to structures, often long before they are discovered; piles of sawdust-like pellets are a distinct sign of infestation; not as widespread as subterranean termite; colonies may contain up to 2,700 members.