Indian meal moth. All damage is done by the larvae, which attack a wide range of products, including cereal and cereal products, flour, cornmeal, rice, dried fruit, dehydrated vegetables, nuts, chocolate, candy and confections. When infestations are heavy, mature larvae can often be found in parts of the house far from the original food source.

(From the University of California)

Confused flour beetles attack milled grain products, such as flour and cereals, hitchhiking into the home in infested flour. They can multiply into large populations. Some survive on food accumulations in cabinet cracks, crevices, and furniture. Because of their small size and shape, they can frequently invade storage containers.

Sawtooth grain beetles infest cereals, cornmeal, cornstarch, popcorn, rice, dried fruits, breakfast foods, flour, rolled oats, bran, macaroni, sugar, drugs, spices, herbs, candy, dried meats, chocolate, bread, nuts, crackers, raisins, dried dog and cat food, and other foodstuffs. They are capable of chewing into unopened paper or cardboard boxes, through cellophane, plastic, and foil wrapped packages. Once inside, populations build rapidly, often spreading to other stored foods and into food debris accumulated in the cupboard corners, cracks, and crevices.

(From Ohio State University)