A key to the species of the genus Centruroides Marx (Scorpionida: buthidae)

This is not a revisionary study. A key to the species of the genus Centruroides, as presently recognized, is presented for the non-systematics. Diagnostic characteristics of the genus are given, followed by a list of 37 species and a key for their determination. A list of subspecies of Centruroides is given followed by synonymies of the Centruroides species and additional species placed in the old genus Centrurus. The discussion points up the need for a revisionary study because of the creation of artificial species due to over-weighting the color characteristics and failure to recognize adequate diagnostic features.