1922] Schmidt, Amphibians and Reptiles of Lower California 653 



2. Digits with a lateral fringe of long spinose scales. (Pacific Coast of Lower 



California.) C. crinitus. 



Digits not fringed 3. 



3. Lateroventral black spots, 3; dorsal spots more or less united into a scalloped 



crossband. (Confined to Cape District of Lower California.) . C. draconoides. 

 Lateroventral spots, 2; dorsal spots more widely separated 4. 



4. Frontal region of head strongly convex; femoral pores usually 12. (Angel de 



la Guardia Island. Gulf of California.) C. spleudidus. 



Frontal region of head plane or nearly so; femoral pores more than 12 (average). 



C. ventralis. — 5. 



5. Lateroventral black spots confluent at their lower extremities; body very 



slender; femoral pores (average) 18; hind leg averaging .96 of body length; 

 tail .57 cf total. (Tiburcn Island and Sonora, Mexico.) 



C. ventralis inusitatus. 

 Lateroventral bars always distinct 6. 



6. Femoral pores (average' 14; tail length (average) .55. (Pyramid Lake, 



Nevada) • C. ventralis my urns. 



Femoral pores (average) more than 14 7. 



7. Femoral pores (average) 17 or more; tail length averages .54; hind leg averages 



.86. (Central Arizona; border of the Plateau.) C. ventralis ventralis. 



Femoral pores average less than 17; tail length averages .58 or more; hind 

 leg averages .92 or more. (Lower California from La Paz north; the 

 Colorado Desert.) C. ventralis gabbii. 



Uta thalassina Cope 



Via thalassina Cope. 1863, p. 104; Stejneger and Barbour, 1917, p. 52. 

 Uta repens Van Denbttrgh, 1895, p. 102; PI. vn-vni, figs. a-e. 



Range. — Southern Lower California. 



Lower Californian Records. — Cape St Lucas, Cope, 1863, p. 104; La Paz, 

 Yarrow, 1882, p 54; Playitas, San Lazaro, Belding, 1887, p. 96; San Jose del Cabo, 

 San Bartolcme, Corral de Piedras (Sierra El Taste), Miraflores, Sierra San Lazaro, 

 Comondu, Van Denburgh, 1895, p. 99; Mulege, Mocquard, 1899, p. 311. San Xavier, 

 Triunfo, San Bartolo, Agua Caliente, Sierra Laguna, Van Denburgh and Slevin, 

 1921o, p. 57. 



The Albatross Expedition collected six specimens of this species 

 at San Bernardo Mountain, Lower California (A. M. N. H. Nos. 5547, 

 5650-51, 5653-54, U. S. N. M. No. 64485). 



Uta repens Van Denburgh was based on a single specimen, distin- 

 guished from Uta thalassina by (1) shorter hind leg, (2) shorter head, and 

 (3) four dorsal black bars instead of three, followed by three dusky bars. 

 In the typical coloration of Uta thalassina, there are three distinct 

 anterior black bars on the back, followed by two dusky ones. The an- 

 terior bars are outlined with very light greenish gray, leaving a darker- 

 interspace between the true bars, which may approach them in depth of 

 pigmentation: the two posterior bars are less distinctly outlined, but in 



