The drugstore beetle gets its name by feeding on pharmaceutical drugs. In Pennsylvania, the drugstore beetle is not a major pest of stored gains, but can be found from time to time in grain bins. The beetles are about one-tenth inch long, light brown to red brown, cylindrical, and have humpbacks. Their bodies are covered with fine, silky pubescence, and they have distinct grooves in their wing covers.
Drugstore beetles have antenna that end in three enlarged segments.
Female drugstore beetle lays eggs singly in almost any dry organic substance. The eggs are oval and white and hatch in six to ten days after deposited. Small white grubs emerge from the eggs and then tunnel through these substances. The larvae have six to nine instars and are about two-tenths inch long when fully developed. The larvae form a small cocoon of silk and food material in which they pupate.