Plate 79 



POISOXOUS SNAKES 



1 a 



2 



2a 



HEADS OF NEW WORLD PIT VIPERS (Note presence 

 of pit between the eye and nostril.) 



1-1 a. Water Moccasin. Ancistrodon piscivorus. S. E. United 

 States. 



2-2 a. Mexican Moccasin. Ancistrodon bilineatus. Mexico. 



3-3 a. Palm Viper. Lachesis schlegelii. Central America. 



