Abstract
Cnemidophorus parvisocius Zweifel is one of the smallest and southernmost species of the sexlineatus species group in Mexico. It occupies the more xeric habitats in the remote Tomellin Canyon in southeastern Puebla and N-central Oaxaca between 518-1692 m elevation. Analysis of snout-vent length data for 457 adults of C. parvisocius revealed the presence of a small northern variant (females, X = 57.4 mm; males, X = 61.3 mm) and a larger southern variant (females, X = 60.3 mm; males, X = 65.5 mm). Males and females are reproductively mature by June following the year of their hatching. Analysis of three geographic samples revealed no variation in clutch size. Clutch size, based upon yolked follicles and oviducal eggs, varied from 1-4 (X = 1.77, 151/85). Cnemidophorus parvisocius has the smallest clutch size reported for a species of the sexlineatus group.
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