210 REPTELIA: TESTUDINATA. — XXX. 



313. CHRYSEMYS Gray. (xpvaSs, gold ; e'^s.) 

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

 Greenish black; plates margined with paler; marginal plates 

 marked with bright rod; 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, hut I have seen no inter- 

 gradations. 



618. C. oregonensis Holbrook. No red markings. Minn, to 

 Ore. 



314. CHELOPUS Kafinesque. (x&vs, tortoise ; novs, foot.) 



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

 downward. (Chelopns.) 



b. Head not notably narrower below than above. 



019. C. muhlenbergi (Schweigger). 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. A\. 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 striae 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. 

 (Xanemys Agassiz.) 



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

 with round orange spots, these spots rarely obsolete ; plastron 

 yellow, blotched with black. L. 4£. E. U. S., W. to N. Ind. 

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



315. EMYS Brongniart. (e'/xv?, a mud turtle.) 



622. E. meleagris (Shaw). 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. (/^Xeayp/y, guinea-fowl.) 



316. CISTUDO Fleming. (Lat., cista, box.) 



623. C. 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- 



