Epicauta pennsylvanica, commonly known as the Pennsylvania blister beetle, is a species of insect belonging to the Meloidae family. These beetles are typically black or dark brown in color and have a cylindrical body shape. They are known for their ability to release a toxic substance called cantharidin, which can cause blistering and irritation on human skin. Pennsylvania blister beetles are often found in fields and meadows, where they feed on various plants and flowers.