196 VERTEBRATE ANIMALS OF THE UNITED STATES 



6. Uma Baird. Body rather stocky, with 2 rows of subdigital scales, 

 and a lateral digital fringe of elongate scales: i species. 



U. notata Baird iU . scoparia Cope). Length 220 mm. ; tail 120 mm. ; 

 ground color black, with numerous large round, white spots, each with a 

 black center; abdomen white, with a black spot on each side: deserts of 

 southeastern Cahfornia. 



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 black bands beneath H. tcxana. 



a2 Tail round. 



bi Tail longer than the body in both sexes. 



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

 Co Dorsal scales larger, flat. 



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



di Size smaller; femoral pores usually less than 12 H. pulchra. 



h-2 Tail shorter than the body in females, and usually also in males. 

 Ci Black subcaudal spots usually present; dorsal spots sharply 



defined H. lacerata. 



C2 No subcaudal spots; dorsal spots not sharply outlined H. maculata. 



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

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

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

 headland body : western Texas to eastern Arizona. 



H. propinqua Baird & 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. pulchra 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. 



