Plate as 



POISONOUS SNAKES 



TIMBER RATTLESxXAKE Crotalus horrldus. Eastern 



Xorth America. 



This is the common rattlesnake of the eastern United States. 



Black and yellow phases are equally abundant. 



HORNED RATTLESNAKE Crotalus cerastes. 

 Inhabits the deserts of the southwestern portion of the U. S. 

 Note the similarit}^ in the pallid coloration and horns over the eyes 

 to the sand vipers of the Sahara Desert. Plate 71. 



