164 EEPTILES. 



middle one, instead of forming sets of three as in the 

 eastern form; lateral plates with strong concentric strife. 

 W. N. Y. and W., common. C. oregonensis, (Holb.) Ag., 

 without red markings, occurs in Minn, and W. 



6. MALACOCLEMMYS, Gray. MARSH TURTLES. 



* Lower jaw spread out into a spoon-shaped dilatation; head with 



a horny skin ; inland turtles. (Graptemys, Ag.) 



1. M. geographicus, (LeS.) Cope. MAP TURTLE. Dark 

 olive brown with greenish and yellow streaks and retic 

 ulations, especially distinct on neck, legs and edges of 

 carapace; plastron yellowish; carapace strongly notched 

 behind and usually decidedly keeled. Miss. Valley, E. 

 to N. Y. 



2. M. pseudogeographicus, (Holbr.) Cope. LESUEUR S 

 MAP TURTLE. Much like the preceding but grayer, the 

 markings on the shell paler, less distinct and in larger 

 pattern; keel of carapace stronger, each plate of the 

 vertebral series with a blackish projection behind, which 

 is more or less imbricated over the succeeding plate; 

 plastron yellowish, marbled with blackish; head, neck 

 and legs with bright yellow stripes. Wis. to Oliio and 

 S. W. 



** Sheath of jaws straight, the cutting edges smooth; salt-marsh 

 turtles. (Malacoclemmys.} 



3. M. palustris, (Gmel.) SALT-MARSH TURTLE. 

 DIAMOND - BACK. Greenish or dark olive; plates, both 

 of carapace and plastron, with concentric dark stripes. 

 N. Y. to Texas, along the coast. 



7. PSEUDEMYS, Gray. TERRAPINS. 



* Jaws serrated. (Ptychemys, Ag.) 



1. P. rugosa, (Shaw). RED-BELLIED TERRAPIN. Dusky, 

 with red markings above; marginal plates with much 

 red; plastron red or partly yellowish; neck, etc., with 



