forms which are easily ascertainable are the facts 

 that the poisonous species possesses a blind depres- 

 sion or pit between nostril and eye, and that the 

 plates on the ventral surface of the moccasin's tail 

 are single, while those of the Common Water Snake 

 are in two rows. These features are well illustrated 

 by the exhibit. Natrix sipedon is ovoviviparous. 

 65. Natrix taxispilota (Holbrook). 

 WATER.PILOT. 

 This striking form inhabits the swamps and 

 rivers of the Southern U. S. and attains a greater 

 size than any other member of the genus, occasion- 

 ally reaching a length of six feet. 

 Storeria (Genus) 



66. Storeria occipito -maculata (Storer). 



RED-BELLIED SNAKE. 

 Found among rocks or flat stones, under which 

 it hides during the day. Feeds on soft-bodied in- 

 sect larvae and on snails. 



Thamnophis (Genus). 



67. Thamnophis sirtalis sirtalis (Linne). 



COMMON GARTER SNAKE. 

 Pethaps the most abundant and most well 

 known North American snake. 

 68. Eggs of Colubroid snake, found in a rotten log 

 at Ferris' Woods, Cincinnati, Ohio. 

 Tantilla (Genus) 

 69. Tantilla coronata Baird & Girard. 



CROWNED SNAKE. 

 Interesting as being our only Eastern Opis- 

 thoglyph snake. A diminutive, burrowing species. 



