THE LIZARDS 151 



Smooth Horned Lizard,2 p. platyrhinum. Southwestern U. S. 



Little Horned Lizard, 2 p. modestum. S. W. U. S.; Mexico. 



Species with long horns. 



Goode's Horned Lizard, P. goodei. Sonora, Mexico. 



Ashy Horned Lizard, P. calidiarum. Colorado Desert. 



MacCall's Horned Lizard, P. maccallii. Colorado Desert. 



Cerros Is. Horned Lizard, P. cerroense. Cerros Island. 



Pacific Horned Lizard,2 P, coronatum. So. Pacific Region, U. S. 



Regal Horned Lizard, 2 P. regale. Colorado Desert. 



Texas Horned Lizard,2 P. cornutum. Texas to California. 



Bracconier's Horned Lizard, P. bracconieri. Mexico. 



Mexican Horned Lizard, P. taurus. Mexico. 



Long-spined Horned Lizard, P. asio. Mexico. 



2 Common species. 



Douglass's Horned Lizard, P. douglassii, really 

 belies its name, as the "horns" are represented by mere 

 tubercles. It is one of the smallest species and has 

 very short limbs. Moreover, it is found farther north- 

 ward than any other member of the genus, occurring 

 in the northern Pacific region of the United States 

 including the slopes of the Sierra Nevada Mountains. 

 A curious variety known scientifically as P. douglassii 

 ornatissimum, inhabits the dry plateaus and deserts east 

 of the typical form from southern Canada to Mexico. 

 It displays remarkable phases of "mimicry." Exam- 

 ples found on pinkish rocks exactly match the pale 

 hue; others, from the yellow, desert sands, are of the 

 same color as the soil and it is difficult to see them unless 

 they are moving. Another variety of the species is 

 Hernandez's Horned Lizard, P. douglassii hernan- 

 dezi, growing to a considerably larger size than the 

 typical form; it has pronounced, though very stubby 

 horns. This lizard is abundant throughout the Great 

 Plains and Rocky Mountain District. A near ally is 

 the Red Horned Lizard, P. orbiculare, of Mexico. 

 Above, the color is dark, brick red with little or no 

 traces of markings. 



Without doubt the most showy species of Phryno- 



