The Pit is a deep orifice located in the side of 

 the face between nostril and eye; it is Hned with a 

 delicate membrane and is connected with the brain 

 by a well-developed nerve. Its use is not known, 

 but it serves as a convenient character for recog- 

 nition of members of the family Crotalidae. The 

 Copperhead occurs in Ohio, often being found in 

 abandoned quarries. 



72. Agkistrodon piscivorus (Lacepede). 



COTTONMOUTH MOCCASIN. 

 Our only poisonous watersnake. Not found 

 north of West Virginia. The young of this species 

 resemble the preceding (see exhibit) . 

 Crotalus (Genus) 

 73. Crotalus adamonteus Beauvois. 

 DIAMOND-BACK RATTLESNAKE. 

 Our largest and most dangerous snake. Spec- 

 imens have been reported 13 feet in length but 

 there is no evidence to show that the species 

 ever exceeds eight and one-half feet. 



74. Crotalus atrox atrox (Baird & Girard). 



WESTERN DIAMOND-BACK. 

 Western representative of the preceding, but 

 much smaller. Feeds on rodents and other warm 

 blooded prey. 



75. Crotalus horridus Linne. 



TIMBER RATTLESNAKE. 



This is the common Eastern member of the 



genus. Frequents timbered areas from Maine to 



Georgia, westward to the great plains. Appears 



in several color varieties; a black form is found in 



