194 VERTEBRATE ANIMALS OF THE UNITED STATES 



b2 No middorsal crest of enlarged scales present. 

 Ci Body lizard-like, head without horns. 



di Tail blunt, superciliary scales not imbricate 3. Sauronialus. 



d.2 Tail long and attenuate; superciliary scales imbri 

 cate. 



61 Upper labial scales oblique and imbricate (P'ig. 



102). 

 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 (Fig. 



99)- 



i-i Head plates small 4. Crotaphytus. 



fo Head plates large. 



gi A collar of enlarged scales crossing the 



throat : . . . . 8. Uta. 



go No collar across the throat 9. Sceloporus. 



C2 Body broad and flat, toad-like; head with spines or 



horns 10. P/iryuosoma. 



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. carolinensis Voigt. Chameleon (Fig. 

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

 FiG. loi.^Foot of Anolis changes very remarkable and equal to those 



carolinensis (from Diimars). c ^.^ l i. i r ^i tt' 



of the true chameleon of southern Europe, 

 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 lizards with a mid- 

 dorsal crest of enlarged scales: i species. 



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

 long; tail 180 mm.; color pale brown, with wavy longitudinal brown or 

 black hues 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. 



S. ohesus (Baird). Chuck-walla. Body thick and broad and 300 

 mm. long; tail 140 mm.; greatest length 400 mm.; color black or dark 



