REPTILES 183 



Ci Upper labial scales oblique and imbricate, 

 fi Tympanum distinct; ear-opening evident. 



gi A fringe of elongate scales on the toes 6. Uma. 



g2 No digital fringe present 5. Callisaurus. 



U Tympanum hidden; ear-opening absent 7. Holbrookia. 



62 Upper labial scales not oblique or imbricate. 



fi Head plates small 4. Crotaphytus. 



it Head plates large. 



gi A collar of enlarged scales crossing the throat . 8. Uta. 



g2 No collar across the throat 9. Sceloporus. 



C2 Body broad and flat, toad-like; head with spines or horns . 10. Plirynosoma. 



1. Anolis Daudin. Body slender and more or less compressed; 

 head flattened; throat of male with a large ventral fold of skin which 

 when dilated is fan-shaped: 120 species of arboreal, brilliantly colored 

 lizards confined to tropical America; i species 

 in the United States. 



A. caroUnensis Voigt. Chameleon (Fig. 

 loi). Length 175 mm.; tail 120 mm.; color- 

 changes very remarkable and equal to those Fig. ioi.— Foot of AnoUs car- 

 of the true chameleon of southern Europe, oiimnsis {from DUmars). 

 the color being usually green or brown, yellow, gray or black; 

 throat-fan, when dilated, crimson; middle portion of the toes expanded: 

 coastal regions of the southern States, from the Neuse River, 

 North Carolina, into Mexico; abundant; diurnal and insectivorous; 

 easily tamed. 



2. Dipsosaurus Hallowell. Large, thick-bodied Hzards with a 

 mid-dorsal crest of enlarged scales: i species. 



D. dorsalis (Baird & Girard). Keel-backed lizard. Length 380 

 mm.; tail 250 mm.; color pale brown, with wavy longitudinal brown or 

 black lines on the back: deserts of southwestern States and Mexico; 

 herbivorous. 



3. Sauromalus Dumeril. Large, blunt-tailed lizards with very 

 small imbricated scales; claws very thick and strong; a prominent neck- 

 fold: 2 species, i in the United States. 



5. obesus (Baird). Chuck-walla. Body thick and broad; length 

 300 mm.; tail 215 mm.; color black or dark brown; tail whitish; belly 

 reddish: deserts of southwestern States; northward into Nevada and 

 Utah; herbivorous; used for food; often abundant. 



4. Crotaphytus Holbrook. Large, brightly-colored hzards with 

 a very long, tapering tail and small granular scales and a neck-fold: 

 5 species, 4 in the United States. 



