List of Half-tone Illustrations 



PLATB FACING PAGE 



xliii. STANSBURY'S SWIFT, Uta stansburiana . . . 125 

 WHITE-BELLIED SWIFT, Uta symmetrica . . 125 



CLARK'S SWIFT, Sceloporus darkii . . -125 



xliv. COMMON SWIFT; FENCE LIZARD, Sceloporus undu.- 

 latus. SPINY SWIFT; TEXAS SWIFT, Scelop- 

 orus spinosus . . . . . .128 



PACIFIC SWIFT, Sceloporus undulatus occidentalis ' . 128 

 BANDED SWIFT, Sceloporus undulatus consobrinus . 128 



xlv. WESTERN SWIFT, Sceloporus biseriatus . . .129 

 COLLARED SWIFT, Sceloporus torquatus poinsettii. 



The Finest Species of its Genus. . . .129 



xlvi. HEADS OF HORNED LIZARDS, Pbrynosoma . . 144 



xlvii. DOUGLASS'S HORNED LIZARD, Pbrynosoma doug- 



lassii ........ 145 



PAINTED HORNED LIZARD, P. douglassii orna- 



tissimum . . . . . . 145 



HERNANDEZ'S HORNED LIZARD, P. douglassii 



bernandesi . . . . . . -145 



xlviii. DITMARS'S HORNED LIZARD, Phrynosoma diimarsii . 148 

 MEXICAN HORNED LIZARD, Pbrynosoma orbiculare . 148 



x ix. REGAL HORNED LIZARD, Pbrynosoma regale . . 149 

 PACIFIC HORNED LIZAR-), Phrynosoma coronatum . 149 



1. TEXAS HORNED LIZARD, Pbrynosoma cornutum. 

 Commonest and Most Widely Distributed of 

 the Horned Lizards. ... .156 



ASHY HORNED LIZARD, Phrynosoma calidiarum . 1 56 

 li. KEELED LIZARD, Gerrhonotus muHicarinatus '57 



LONG-TAILED EXAMPLE OF THE KEELED LIZARD, ^ 



Gerrhonotus multicarinatus . . 157 



Hi. BROWN LIZARD, Gerrhonotus liocephahts . . 160 



KING'S LIZARD, Gerrhonotus kingii. The Most 



Brightly Coloured Member of its Genus. . 160 



liii. PLATED LIZARD, Gerrbonotus imbricatus . . i6j 



GLASS "SNAKE," Opbisaurus ventralis . 16 



xxvi 



