210 EEPTILIA: TESTUDINATA. — XXX. 



313. CHRYSEMYS Gray. (xpvtrSs, gold ; e/ivs-) 



616. C. picta (Hermann). Painted Turtle. Mud Turtle. 

 Greenish black ; plates margined with paler ; marginal plates 

 marked with bright red; plastron yellow, often blotched with 

 brown. L. 8. E. U. S., one of the most common turtles. (Lat., 

 painted.) Westward it gives place to — 



617. C. marginata (Agassiz). Plates of carapace alternating 

 or in quincunx, the lateral rows out of line with the middle one, 

 instead of forming sets of three as in the eastern form ; lateral 

 plates with strong concentric striae. W. N. Y. and W., common. 

 Perhaps a variety of the preceding, but I have seen no inter- 

 gradations. 



618. C. belli Gray. No red markings. Minn, to Ore. 



314. CLEMMYS Wagler. (KXe/i/iur, tortoise.) 



a. Carapace usually more or less keeled; upper jaw deeply notched and arched 

 downward. 

 b. Head not notably narrower below than above. 



619. C. muhlenbergi (Sohweigger). Brown with yellowish 

 markings ; plastron black with yellowish blotches ; an orange spot 

 on each side of neck ; plates of back plain or concentrically grooved. 

 L. 4^. E. Penn. and N. J. 



bb. Head decidedly narrower below than above. 



620. C. insculptus (Le Conte). Wood Tortoise. Shell car- 

 inated, its plates marked with concentric strise and radiating black 

 lines ; reddish brown ; plastron with a black blotch on each plate. 

 L. 8. E. U. S., E. of Ohio, in woods and fields. (Lat., engraved.) 



aa. Carapace not keeled; upper jaw slightly notched, its edge nearly straight. 

 {Nanetnys Agassiz.) 



621. C. guttatus (Schneider). Speckled Tortoise. Black, 

 with round orange spots, these spots rarely obsolete ; plastron 

 yellow, blotched with black. L. i\. E. U. S., W. to N. Ind. 

 (Levette), abundant E. (Lat., spotted.) 



315. EMYDOIDEA Gray, (f/iur, a mud turtle.) 



622. E. blandingi (Holbr.). Black; usually with yellowish 

 spots ; plastron yellowish with black blotches ; head with yellow 

 spots ; young nearly circular, and black. L. 8. N. Y. to Wis., 

 scarce. 



316. TERRAPENE Merrem. 



623. T. Carolina (L.). Common Box Turtle. Colors very 

 variable, chiefly blackish and yellowish ; no two alike in pattern ; 

 iris red in $ ; hind feet with 4 toes ; young keeled, the keel grow- 



