Phoracantha is a genus of longhorn beetles commonly known as eucalyptus borers. These insects are native to Australia and are known for their destructive feeding habits on eucalyptus trees. The adult beetles are large, measuring around 20-30 millimeters in length, and have a cylindrical body shape with long antennae. The larvae of Phoracantha bore into the wood of eucalyptus trees, causing damage to the tree's structural integrity.