Blister beetles are common insects found feeding on the flowers and foliage of various plants. Occasionally some, e.g., potato beetles , become serious defoliating pests of potatoes, tomatoes, beets, asters, and other crops and flowers. The larvae are predacious or parasitic, feeding on the eggs of grasshoppers and of bees. Blister beetles undergo hypermetamorphosis, a complex life cycle with several different larval forms.
Adults emerge in midsummer.
One group of blister beetles has body fluids that contain cantharadin, a substance that can cause the skin to blister, from which the family gets its name. The lethal dosage for man is about .03 grams. Another group of meloid beetles has no cantharadin and is sometimes called the oil beetles because of the oily substance they secrete as protection against predators. Blister and oil beetles may be brushed into pans of kerosene or killed with systemic poisons or contact insecticides. Blister beetles are classified in the phylum Arthropoda , class Insecta, order Coleoptera, family Meloidae.