REPTILES 187 



Subspecies of U . ornata 



U. 0. ornata B. and G. In Texas. 



U. 0. linearis Baird. In southern Arizona. 



U. 0. symmetrica Baird. In the Colorado desert. 



9. Sceloporus Wiegmann. Spiny swifts. Small, active lizards 

 with large-keeled, sharply pointed and bristling scales; large supraocular 

 scales present; ear distinct; no neck fold: about 35 species, mostly in 

 desert regions of tropical America, several species, not here mentioned, 

 entering the United States from Mexico. 



Key to the more common United States Species of Sceloporus 



ai A single row of large supraocular scales, bordered on each 

 side by a single row of small scales, 

 bi Median row of small scales extending around forward 

 two-thirds only of cresentic margin of supraocular 



scales 5. clarkii. 



ho Median row of small scales extending completely 



around cresentic margin S. spinosus. 



3-2 A single row of large supraocular scales, bordered by a 

 single median and 2 ventral rows of small scales (Fig. 

 los). 



bi A broad black color on the sides of the neck 5. jarrovil. 



h-> No collar present. 



Ci In the Great Basin and Pacific region 5. occidentalis. 



C2 In the Great Plains region and west to CaHfornia. .S. consobrinus. 



C3 In central and east-central Florida S. woodi. 



a 3 Supraocular plates similar to ao, but wrinkled and some- 

 times with 3 ventral rows of small scales 5. nndidalus. 



34 Two rows of supraocular scales, bordered above by i and 

 below by i or 2 rows of small scales. 



bi A broad, black collar round the neck 5. torquatus poinsetti. 



hi No collar present 5. graciosus. 



S. undulatiis (Latreille). Pine lizard; fence lizard; swift (Fig. 106). 

 Length 140 mm.; tail 70 mm.; scales large and rough; color grayish or 

 greenish, with a series of black, wavy cross bars on the back and a pale 

 band extending backward from the eye on each side: from the Atlantic 

 to the Pacific; from New Jersey, Michigan and Oregon southward; 

 common; in dry, sandy places, especially in pinelands; tail very brittle. 



5. clarkii Baird & Girard. Length 220 mm. ; tail 1 20 mm. ; color gray 

 or brown, with dark transverse bands; a green spot in each scale on the 

 back; broad black collar interrupted above: New Mexico, Arizona and 

 Mexico; common. 



