36 INTRODUCTION 



(Hydrus platurus)* 

 (Crotalus atrox)* 



79. Crotalus exsul 



80. Crotalus lucasensis 



81. Crotalus oreganus 



82. Crotalus enyo 



83. Crotalus mitchellii 



84. Crotalus cerastes 

 (Clemmys marmorata)* 

 (Gopherus agassizii)* 



85. Pseudemys nebulosa 



86. Eretmochelys squamosa 



87. Chelonia agassizii 



88. Caretta olivacea 



The distribution of the reptiles of the islands of the west- 

 ern coast of North America, and of the islands of the Gulf 

 of California, is shown in the following tables: 



Not yet collected, but almost certain to be found. 



