Illustrated interactive keys for identifying treehoppers 

Three online keys are now available for identifying New World membracids to various taxonomic levels, including two original keys for the U.S. presented here by M. S. Wallace. Although no interactive keys are yet available for the Old World treehoppers, Wallace's Online Dissertation provides a standard dichotomous key to the tribes of the Centrotinae, which includes all Old World treehoppers.

Interactive key to tribes of New World treehoppers (Hemiptera: Membracidae), by Christopher H. Dietrich

Interactive keys to the genera and higher taxa of treehoppers (Hemiptera: Membracidae) of the United States: Parts 1-3, by Matthew S. Wallace, 15 Sept 2010.

Part 1. Primer.
Part 2. Key to genera.
Part 3. Key to subfamilies and tribes.