This family is very easily recognized. It has the “horn” or “horns” on the back that make the bug look like a rose thorn. Nymphs of this family will congregate and be tended by ants that love their honeydew production. Adults are much more solitary. This family ranks among my favorite because of the “horns” (aka enlarged pronotum). I wonder what its purpose is. Clifford Dennis wrote a paper on the Membracidae of Wisconsin; it’s excellent for ID purposes and learning more about the treehoppers found here.