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Beetles in the Coleoptera family Meloidae are commonly known as blister beetles. There are approximately 2,500 known species worldwide. They are known as "blister beetles" because they secrete cantharidin, a poisonous chemical causing blistering of the skin and painful swelling. Cantharidin is used medically to remove warts, and is collected for this purpose from species of the genera Mylabris and Lytta, especially Lytta vesicatoria, better known as Spanish fly.