Plate 88 



POISONOUS SNAKES 



TIMBER RATTLESNAKE Crotalus horridus. Eastern 



North 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 similarity in the pallid coloration and horns over the eyes 

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



