660 Bulletin American Museum of Natural History [Vol. XLVI 



7. Hind leg short, .71 to .72 of the body length; dorsal scales very weakly keeled, 



very small (average 115 from rump to occipitals). (San Benito Islands, 



off Pacific Coast of Lower California.) stellata. 



Hind leg more than .72 of the body length; dorsal scales sharply keeled, larger. . . 8. 



8. Dorsal scales largest in the group, 70-78 from occiput to rump; hind leg .79 of 



the body length; femoral pores average 15. (Santa Catalina Island, Gulf 



of California.) squamata. 



Dorsal scales average more than 80 9. 



9. Hind leg averages .80 of the body length. (Southern Lower California.) . elegans. 

 Hind leg averages .74 to .75 of the body length 10. 



10. Dorsal scales average about 86. (Southeastern California to western Texas and 



adjacent areas in Mexico; Angel de la Guardia Island.) 



stansburiana stejnegeri. 

 Dorsal scales average more than 90 11. 



1 1 . Size large, snout to anus 62 mm. (San Martin Island, off Pacific Coast of Lower 



California.) martinensis. 



Smaller, rarely exceeding 50 mm. in body length 12. 



12. Dorsal scales strongly keeled, average about 100; posterior femorals strongly 



keeled. (Southwestern California, San Joaquin Valley, and northwestern 



Lower California.) stansburiana hesperis. 



Dorsal scales weakly keeled, average about 92; posterior femorals weakly 

 keeled. (Cedros and Natividad Islands, off Pacific Coast of Lower Cali- 

 fornia.) concinna. 



13. Frontal transversely divided , 14. 



Frontal entire. (Southern Lower California.) .nigricauda. 



14. Enlarged dorsal scales nearly uniform, with no series of small scales on vertebral 



line; tail long, about two-thirds of total. (Southern Nevada, southeastern 



California, and southwestern Arizona.) graciosa. 



One or more vertebral series of small scales 15. 



15. No tubercular scales forming a well defined dorsolateral line; enlarged dorsals 



nearly smooth; upper posterior scales on thigh smooth. (Socorro Island, 



Revilla Gigedo Islands.) auriculata. 



A well-defined dorsolateral row of tubercles 16. 



16. Enlarged dorsals beginning on the nape; dorsolateral tubercles very large, 



close set. (Clarion Island, Revilla Gigedo Islands.) clarionensis. 



Enlarged dorsals beginning on the shoulders, dorsolateral tubercles smaller and 

 more widely spaced. (The Colorado Desert.) ornata symmetrica. 



Uta nolascensis is not entered in the above key, information on its 

 "key characters" being insufficient. It should apparently be placed 

 next to Uta stansburiana stejnegeri. 



Sceloporus occidentalis bi-seriatus Hallowell 



Sceloporus bi-seriatus Hallowell, 1854, p. 93. 



Sceloporus occidentalis bi-seriatus Stejneger and Barbour, 1917, p. 55. 



Range. — The Great Basin, south to Texas and California. 



Lower Californian Records. — San Pedro Martir Mt., and Valladares, Van 

 Denburgh, 1895, p. 114; between Ensenada and San Rafael Valley, and San Telmo, 

 Van Denburgh, 1896, p. 1005; Santo Tomas and Los Encinos, Meek, 1905, p. 11 

 (Heller's notes); Ensenada, Van Denburgh and Slevin, 1921a, p. 59. 



