Adults are reddish brown to blackish brown. Full-grown larvae are yellowish white and C—shaped.
Development. Eggs are laid singly in grain kernels after the female bites a small hole in the surface of the kernel. Hatching is in about 6 days. No eggs are laid on grain with moisture content below 10%. Larval development takes about 26 days. Adults live four to five months.
Habits. This beetle feeds on beans, nuts, cereals, cereal products, macaroni, cake, flour, rice, wheat products, and even fruits, and can infest household cabinets.