Abstract
The teiid lizard Cnemidophorus martyris Stejneger is endemic to Isla San Pedro Martir, a small island in the central region of the Gulf of California about midway between the coast of Sonora and the Peninsula of Baja California, Mexico. Small mesoptychial scales, granular postantebrachial scales, 4-4 or more supraocular scales, and paired frontoparietal scales align the San Pedro Martir whiptail with the tigris species group. A combination of small body size (snout vent length of 80 mm or less), distinctive melanistic dorsal and ventral color patterns, and a dis- tinctive ensemble of scutellation characters is presented as strong presumptive evidence that the potential for reproductive isolation has evolved. C. martyris is treated herein as one among seven distinctive allospecies (allopatric species) in the superspecies C. tigris. C. martyris is most closely
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