R. Zweifel 1953 Cnemidophorus sacki 25 mi NW Elota, Sinaloa, Mexico 2552-9 R2 July 18, 1953 Adults have no stripes. Head gray, body spotted yellow, tail bluish-green along side. Very different from Mazatlan lizards. In 1950 it was noted that the Sonora lizards were striped through adulthood, like those at Mazatlan, while some from near Navajo were spotted, as these Elota lizards. The suggestion of distinct coastal and foothill forms is strengthened. Dark venters. 7 mi W Guachimil, Sinaloa, Mexico 2565-6 R2 July 19 Again the spotted form.