EMYDID^. CXXII. 209 



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. S. W. 



311. MALACLEMMTS Gray. (/ioXaxos, soft ; KXe'fi/iws, 



tortoise.) 



(Lower jaw without spoon-shaped dilatation; the cutting edges smooth.) 



610. M. centrata (Latr.). Salt-marsh Turtle. Diamond- 

 Back. Greenish or dark olive, rarely black ; plates, both of cara- 

 pace and plastron, usually with concentric dark stripes ; shell 

 smooth or with concentric grooves. N. Y. to Texas, along the 

 coast ; valued as food. 



312. PSEUDEMYS Gray. (\;ffuSijs, false; eVur, a mud turtle.) 



a. Loose skin between legs without scales; ridge in alveolar surface tubercu- 

 late ; young marked with confluent, lozenge-shaped figures. 

 6. Jaws coarsely serrated; symphysis of upper with prominent hook. 



611. P. rubriventris (Lee). Ked-bellied Tberapin. Dusky, 

 with irregular red markings above ; marginal plates with much red ; 

 plastron red or partly yellowish; head and neck brown, with red- 

 dish lines ; variable. N. J. to Va. 



bb. Jaws not serrated. 



612. P. hieroglyphica (Holbrook). Shell smooth, depressed; 

 olive brown, variously marked with reticulated or concentric 

 yellowish lines ; plastron yellowish ; head and neck with yellow 

 lines ; head small. N. Y. to Wis. and S. 



aa. Loose skin between legs not scaly ; ridge in alveolar surface not tubercu- 

 lar ; edge of marginal plates notched. Vertebral plates with length- 

 wise bands, other scales with transverse bands, these growing obscure 

 with age. 

 c. Carapace not keeled. 



613. P troosti (Holbrook). Yellow-bellied Terrapin. 

 Greenish-black, lateral plates with horn-colored lines and spots ; 

 plastron dull yellow, with large, black blotches ; throat with green- 

 ish stripes ; shell never keeled. Miss. Valley, N. to El. 



614. P. elegans (Wied). Brown, with yellowish wayy lines and 

 blotches ; a red or yellow band on each side of neck ; plastron 

 yellow with a dusky blotch on each plate. 111. to Idaho, and S. 



cc. Carapace strongly keeled. 



615. P. sorlpta Schopf. Dark brown, with irregular yellow 

 stripes ; plastron yellow with small black blotches in front ; head 

 and neck black, with yellow lines; carapace wrinkled. Va. 

 to Fla. 



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