REPTILES 185 



7. Holbrookia Girard. Spotted lizards. Small, rather slender, 

 flattened lizards with very small scales; color pale, with 2 rows of dark 

 blotches on the back, a row of more or less indistinct blotches on 

 the side and 2 black bars on the lower portion of each side; upper labials 

 imbricate; no external ear-opening: 7 species, 6 in the United States. 



Key to the United States Species of Holbrookia 



ai Tail flat, with broad l)lack bands beneath H. texana. 



ao Tail round. 



bi Tail longer than the body in both se.xes. 



Ci Dorsal scales very small, conve.x or keeled; tail very long. .H. propinqua. 

 Co Dorsal scales larger, flat. 



di Size large; femoral pores usually more than 12 H. elegans. 



d-2 Size smaller; femoral pores usually less than 12 H. piilchra. 



b2 Tail shorter than the body in females, and usually also in males. 

 Ci Black subcaudal spots usually present; dorsal spots sharply 



defined H. lacerata. 



C-: Xo subcaudal spots; dorsal spots not sharply outlined H. niaculata. 



H. texana (Troschel). Length 150 mm.; tail with black cross bars 

 on the under surface, almost exactly like Callisaurus ventralis, and held 

 over the body when the animal is running; hind foot half the length of 

 head and body: western Texas to eastern Arizona. 



H. propinqua Baird and Girard. Length 120 mm.; tail 70 mm.; 

 dorsal spots frequently wanting; tail proportionately long; upper 

 labials 7 : southern Texas. 



H. elegans Bocourt. A large, smooth scaled form with sharply 

 defined dorsal spots: deserts west of Tucson, Arizona. 



H. pnlchra Schmidt. A small, smooth scaled form with sharply 

 defined dorsal spots: higher altitudes in mountains of southern Arizona. 



H. lacerata Cope. Under surface of tail with black spots; dorsal 

 spots large, sharply defined; length 106 mm.; tail 52 mm.: central 

 Texas. 



H. maculata Girard. Length 100 mm.; tail 50 mm.; coloration 

 variable: Nebraska and Wyoming to Arizona, southward into Mexico; 

 in dry. rocky places, feeding mainly on insects. 



8. Uta Baird and Girard. Swifts. Small, flattened, active lizards 

 with small scales; ear distinct; collar present; tail longer than the body: 

 about 24 species in the southwestern United States and Mexico. 



Key to the Species of Uta in the United States 



ai Scales on the back uniform, not abruptly larger than those on 

 the sides (Fig. 103). 



bi Scales on the back very small, perfectly smooth U . mearnsi. 



bo Scales on the back larger and more or less sharply keeled . . U. slansburiana. 



