The Horned Lizards 



are smooth and there are no enlarged rows of scales in the cen- 

 tral portion of the chin. 



Colouration. — Pale, yellowish, or pinkish. A large black 

 patch on each side of the nape — but this is sometimes indistinct. 

 There are practically no cross-bars on the back, although the 

 tail is usually banded. The abdomen is yellowish-white and, 

 with the e.xception of the region of the vent, is immaculate; 

 there are frequently several small patches of black both in front 

 and behind the vent. 



Dimensions. — Total Length 3J inches. 



Length of Head, including Horns.. . W " 

 Width of head, including Temporal 



Horns \^ " 



Distribution. — Western Texas, New Mexico and Arizona; 

 the states of Chihuahua and Sonera, Mexico. 



THE ASHY HORNED LIZARD 

 Phrynosoma calidiariim, (Cope) 



The ear drums are not visible, being covered with fine, 

 granular scales. Among those species that follow, all of which 

 exhibit this character, the present one may he recognised by the 

 single row of marginal, spiny scales. 



Back quite spiny; head spines well developed, particularly 

 the central horns, which are directed quite sharply upward. 

 Upon gross examination this resembles the Texas Horned Liz- 

 ard, P. cornutum. The central portion of the chin is covered 

 with small scales, of tiniform si^e. The scales of the abdomen 

 are perfectly smooth. 



Colouration. — Ashy-gray, with wavy black cross-bars. Ab- 

 domen immaculate white; on the chin and at the base of the 

 tail are a few black spots. 



Dimensions.— Ihe measurements of an adult male, from 

 the Gila Desert, are given: 



Total Length 4J inches. 



Length of Tail i J 



Greatest Width of Body i J 



Length of Central Horns J " 



Distribution. — ,^ppears to be very rare. The type spec- 

 imen was taken in Death Valley, eastern California. The writer 

 received a specimen from the Gila Desert, south of Phoenix, 

 Arizona. 



157 



