any of various families (esp. Membracidae) of hopping homopteran insects that feed on plant sap and are characterized by the backward prolongation over the abdomen of the prothorax, which is often extended
See treehopper in American Heritage Dictionary 4
(trēˈhŏpˌər)
noun
Any of numerous, generally small homopterous insects of the family Membracidae, found mostly in the tropics and having mouthparts adapted to sucking the sap from trees.