The attached, linked files provide the characters and character matrix for publications describing immatures of the New World treehoppers (Membracidae, Melizoderdae, and Aetalionidae) by McKamey, Wallner, Porter, Wallace, and Phillips, or some combination thereof. Characters for each body part are assigned a number, and each character within each body part are assigned a letter, because additional characters (and states) are expected to be discovered with each newly examined tribe or subfamily and it is desirable to keep all characters pertaining to a body part together. With each publication, both of these linked files will be updated. Presently, the characters and matrix cover the tribes Amastrini and Thuridini (Smiliinae). Resources in this dataset:Resource Title: 2015 Characters. File Name: 2015 Characters.pdfResource Description: Characters and states for treehopper nymphs. Partly because character states were appended as discovered, and partly because of their plasticity, we recommend that, if these characters are used in a cladistic analysis, they be treated as unordered states.Resource Title: May 2015 Matrix. File Name: May 2015 matrix.pdf