Lizards of the genus Cnemidophorus long have been a thorn in the sides of herpetologists. Commonly known as whiptail lizards or racerunners, species in this genus occur in North, Central, and South America. Probably the most confusing thing about these lizards is the ontogenetic change in color pattern, which through its variety of manifestations runs the gamut in convergence and parallelism. The purpose of this study is to review the species of the deppei group of Cnemidophorus and to present a classification of them, using some taxonomic characters that previously have not been applied....