Grain Beetles are the little pests that come out of your pet food, rice, cookies, flour, etc. There are many different species that we deal with, but they generally all feed on open packaged products that you purchase from your local grocery stores. When in the larvae stage, they generally feed on the same food as the adults.
Meal moths (indian meal moths being the most common) also fall into this category, except that most of the damage to food is done by the larvae. However, the adults are usually the ones you will see flying after the larvae/pupae stage. Unfortunately, for proper control, all open food must be discarded, and your cupboards must be cleaned out and washed before they can then be properly treated with an insecticide to get them under control.