M. Zweifel 1953 Cnemidophorus sacthi 9 mi. N Mazatlan, 500', Sinaloa, Mexico July 13 Very abundant on the Thorn Forest shortly after the morning rain had ceased at about 11:00 A.M., The lizards continued active throughout the day. A lined pattern is present on the largest adults, though spotting is well developed. The dorsal field is conspicuously lighter than the lateral fields in both young and adults. 2528 R2 July 15 SV 94 mm. Paravertebral fields (there is no vertebral stripe) confluent, light brown. Lateral fields dark brown. Very little spotting. No spots on hind limbs.