EMYDID^. — CXXII. 209 



keel of carapace stronf^er, 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. MALACLEMMYS Gray. ([jLaXaK6s, soft ; K\efifivs, 

 tortoise.) 

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

 GIO. 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. (^IrevB^s, Msc; tuis, a. mud turtle.) 



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

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

 b. Jaws coarsely serrated; symphysis of upper with promiuent hook. 



611. P. rubriventris (Lee). Red-bellied Terrapin. 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. 



66 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; 

 ])Iastron dull yellow, with large, black blotches ; throat with green- 

 ish stripes; shell never keeled. Miss. Valley, N. to 111. 



014. P. elegans (Wied). Brown, with yellowish wavy lines and 

 blotches ; a red or yellow l)and 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. scripta Schbpf. 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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