Weevils Do Wasps Bite? After some time, weevils morph into sexually mature adults with hard outer shells. Bin Weevils is an engaging environment which brings social and educational values to children by providing a safe space for them to communicate with other players, and providing multiplayer games. They often appear reddish brown and measure approximately 3 to 4 mm in length. Once grain weevils (a.k.a. Recently I few days ago I returned from a hunt in Amarillo Texas to my home in Tennessee. The insect that is usually called the flour weevil is probably the red flour beetle or confused flour beetle. Life Cycle.