Flour Beetle, or Flour Weevil, a tiny beetle that infests flour and cereal grains. Both the red flour beetle and the confused flour beetle (so named because it is often confused with the red flour beetle) grow to less than one-fourth of an inch (6 mm) long. They multiply rapidly and each year devour vast amounts of flour. The larvae, or grubs, of some species are called meal worms. They are used to feed pet birds and fish.

Flour beetles belong to the darkling beetle family, Tenebrionidae, of the order Coleoptera. The red flour beetle is Tribolium castaneum; the confused, T. confusum.