210 REPIILIA : TESTUDINATA. — XXX. 



313. CHRYSEMYS dray, (xpvao;, gold ; f'fivs.) 

 GIG. C. picta (lliriiKuiu). P.mntkd Tukti.i:. Mud Tuutle. 

 Greenish black; jilates margined witli paler; marginal plates 

 marked with bright red; plastron yellow, often blotched with 

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

 painted ) Westward it gives place to — 



G17. C. marginata (Agassiz). IMates of carapace alternatin'r 

 or in ([uincun.x, the lateral rows out of line with the middle one, 

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

 j)lates with strong concentric stria;. W. N. Y. and W., counnon. 

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

 gradations. 



G18. C. belli Gray. Xo red markings. Minn, to Ore. 

 314. CLEMMYS Wagler. (KXt/i/xK?, tortoise.) 



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

 downward. 



b. Head lint iiotaMy ikiitowct below than above. 



Glf). C. muhlenbergi (Scliweigger). 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 C'onte). Wood Tortoise. Shell car- 

 inated, its plates marked with concentric striae and radiating black 

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

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



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

 (Nanemys Agassiz.) 



621. C. guttatus (Schneider). Spkcklp:d Tortoise. Black, 

 with round orange spots, these spots rarely obsolete ; plastron 

 yellow, blotched with black. I.. 1^. E. U. S., W. to N. Ind. 

 (Levetle), abtnidant E. (Lat., spotted.) 



315. EMYDOIDEA Cray. (tfiCs, a mud turtle.) 

 022. E. blaudiugi (Iljll.r.). Black; usually with yellowi-^li 

 spots; plastron yellowish with black blotches; head with yellnw 

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

 scarce. 



316. TERRAPENE Merrem. 

 62.3. T. Carolina (L.). Common Box Tirti.e. Colors very 

 varialtlo, cliiclly blackish and yellowish; no two alike in pattern; 

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



