A Guide to the Spider Mites (Tetranychidae) of the United States is a manual of plant feeding spider mites of the family Tetranychidae of the United States, and the complete guide to identification of 216 species and 31 genera. A valuable resource designed for students, teachers, acarologists and plant quarantine specialists who want to look for information on tetranychid mites. This manual contains keys, descriptions of the species, host plants with common and scientific names, distribution, references and over 226 illustrations of tetranychid mite structures used in the identification.