Dr. J. E. Gray on American Emydidse. 181 



Callichelys^ n. g. = E)n7/s, Sect. *§ Gray, Cat. Shield Rept. 24 

 (1855). 



1. C. ornata = E. ornata, Gray, Cat. Shield Uept. p. 24, t. 12. 



2. C. venusta = E. venusta, Gray, I. c. 24, 1. 12 a. 



3. C. callirostris = E. callirostris, Gray, I. c. 25, 1. 12 b. 



4. C? pulcherrimus=E. jJulcherrimus, Gray, I. c. 25, t. 25. f. 1, 2. 



Trachemys, Agassiz, Contrib. 434 {1857). = Emys, Sect. *§§ 

 Gray, Cat. Shield Rept. 25 (1855). 



1. T. Holbrookii. E. HolhrooUi, Gray, Cat. I.e. 25, t. 15. f. 1. 

 E. eumberlandensis, Holbrook, t. 18. E. sanguinolenta, Gray, 

 Cat. /. c. 1. 15. f. 1. T. elegans, Agassiz, Contrib. i. 435, t. 3. 

 f. 9-11. E. elegans, Neuvvied. 



2. T. scripta, Gray, /. c. 26. E. serrata, Holbrook, t. 5. T. 

 scaler, Agassiz, Contrib. i. 434, t. 2. f. ]3-15 (young). 



3. T. Troostii, Agassiz, Contrib. 435. Emys Troostii, Gray, 

 /.C.28; Holbrook, 1, t. 20. 



4. T. rugosa, Agassiz, Contrib. 436. Emys rugosa. Gray, Cat. 

 31; Shaw, Zool. iii. t. 4. Var. ?z;erm«CM/a^a, Gray, Cat. 

 t. 12^. 



Chrysemys, Gray, Cat. Tort. 27 (1844) ; Agassiz, Contrib. i. 

 438 (1857). 



1. C. picta, Gray, Cat. /. c. 33; Agassiz, Contrib. i. 438, t. 1. 

 f. 1-5, t. 3. f. 4, t. 9. f. 22, 23. 

 C. Bella, Gray, /. c. 33 ; Agassiz, Contrib. i. 439, t. 6. f. 8, 9 



(very young). 

 C. Orbigniensis, Agassiz, Contrib. 444, t. 3. f. 1, 3 (young) 



= C. Nuttallii, Agassiz, Contrib. ii. 642. 

 C. marginata, Agassiz, Contrib. 439, 1. 1. f. 6, t. 5. f. 1. 

 C. dorsalis, Agassiz, Contrib. 440. 



I do not say these local varieties are not distinct, but they 

 are not characterized ; and the series in the Museum shows that 

 the species is very variable, and seems to include some of 

 them. 



I formerly separated C. Bellii, which, when I had only a single 

 specimen, I thought probably might be distinct. 



Malaclemys, Gray, Cat. Tort. Brit. Mus. 28 (1844). Emys, 

 §** Gray, 1828. Malacoclemys, Agassiz, Contrib. i. 437. 

 Euchyloclemj/s, Sclater, Ann. & Mag. Nat. Hist. i. 292 (1858). 



M. concentrica. Gray, Cat. /. c. 37. Malacoclemys palustris, 

 Agassiz, Contrib. i. 437, t. l.f. 10-12 (young). 



Professor Agassiz truly observes, " this species varies most re- 



