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DEFINITION. Cnemidophorus laredoensis is an obligate parthenogenetic species of medium size; mean adult SVL= 68.8 f 0.22 mm (SE), range 60-86 mm, and only about 2% of specimens measure 80-86 mm. This species has an allodiploid chromosome number of 46 derived from hybridization between n the bisexual species Cnemidophorus gularis and C. sexlineatus.

A member of the sexlineatus species group (sensu Burt 193 1, Duellman and Zweifel 1962), it typically has 3 parietal scales, 2 frontoparietal scales, 4 left and 4 right supraocular scales (Fig. 3), enlarged and angular mesoptychial scales bordering the edge of the gular fold, and moderately enlarged and hexagonal postantebrachial scales (ie, neither granular nor enlarged and platelike; Fig. 4). Meristic data based on a sample of over 500 specimens examined by the junior author are as follows (all values are mean-+ SE): granules around midbody 91.6* 0.09 (range 82-103, N= 550); granules from occiput to rump 228.5 f 0.23 (202-245, N= 536); granules between the paravertebral stripes at midbody 1 1.0 f 0.04 (7-15, N= 556); ratio of granules between paravertebral stripes to granules around midbody 11.9+ 0.04 (7.5-16.6, N= 550); femoral pores (left plus right) 32.8+ 0.05 (28-37, N= 541); left subdigital lamellae of the fourth toe 33.4+ 0.05 (30-37, N= 534); circumorbital scales (left plus right) 10.6+ 0.05 (8-19, N= 546); lateral supraocular scales (left plus right) 29.7+ 0.15 (2C55, N= 541); enlarged mesoptychial scales bordering the gular fold 17.0+ 0.04 (13-21, N= 534); interlabial scales (left plus right) 19.6 k 0.16 (6-31, N= 540).