List of Half-tone Illustrations 



PLATE fACtttO PACE 



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



WHITE-BELLIED SWIFT, Uia symmetrica . . 125 

 CLARK'S SWIFT, Sceloporus clarkii . . .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, Pbrynosoma ditmarsii . 148 

 MEXICAN HORNED LIZARD, Pbrynosoma orbiculare . 148 



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

 PACIFIC HORNED LIZARD, Pbrynosoma coronatum . 149 



1. TEXAS HORNED LIZARD, Pbrynosoma cornutum. 

 Commonest and Most Widely Distributed of 

 the Horned Lizards. . . . . .156 



ASHY HORNED LIZARD, Pbrynosoma calidiarum . 1 56 

 li. KEELED LIZARD, Gerrbonotus multicarinatus . 157 



LONG-TAILED EXAMPLE OF THE KEELED LIZARD, 



Gerrbonotus multicarinatus . . . 157 



lii. BROWN LIZARD, Gerrbonotus liocepbalus . .160 

 KING'S LIZARD, Gerrbonotus kingii. The Most 



Brightly Coloured Member of its Genus. . 160 



liii. PLATED LIZARD, Gerrbonotus imbricatus . . .161 

 GLASS "SNAKE," Opbisaurus ventralis . . 16 



xxvi 



