Blister beetles, from the family Meloidae, are sometimes referred to as oil beetles and found in all parts of the Unites States and Canada. Adult blister beetles vary in size and color but are recognized by the elongated, narrow, cylindrical, and soft bodies. In Nebraska, the three-striped, grey, and black blister beetles (Fig. 1) are the most common species. Blister beetles produce a chemical called cantharidin which is toxic to animals and humans. The male blister beetle secretes cantharidin and presents it to the female after mating.