COUES AND YARROW ON HERPETOLOGY. 261 



Famil}^ TEIONYCHIDiE. 

 Genus ASPlbONECTES. Wagler. 



ASPIDONECTES SPINIFER. [LeS.) A(J. 



Trionyx spiniferus, Le Sueur, M6m. Mus. d'Hist. Nat. xv. 258, pi. 6. 



Aspidonectes spinifer, Agass. Contrib. Nat. Hist. U. S. i. 1857, 403. — Cope, Check List 



N. A. Bat. and Rep. 1875, 51. 

 Trionyx ocellatus, Lb Sueur (young 9 , fide Agass. ; not of DeKay, which is Amyda 



mutica). 

 Trionyx ferox, partim, Aliq. 



The Northern and Northwestern Aspidonectes, the characters and 

 synonymy of which were first satisfactorily distinguished from those of 

 the Southern A. ferox by Professor Agassiz in the work above cited, is 

 represented as a common species from New York and Pennsylvania to 

 the Eocky Mountains, where it is mentioned as occurring by Lewis and 

 Clarke. According to Say and Allen, it is frequently found in the trib- 

 utaries of the Missouri; the last-named naturalist took it in the Mussel- 

 shell and Yellowstone. {See Allen, Proc. Bost. Soc. Nat. Hist. 1874, 

 p. 69.) 



Family CHELYDRID^. 



Genus CHELYDEA. Schw. 



Chblydra serpentina. {L.) Earl. 



Snapping Turtle: 



Testudo serpentina, Linn. Syst. Nat, ed. 12, i. 1766, 354 (localities erroneously assigned 



as Algiers and China). Also of other older authors. — LeC. Ann. Lye. Nat. Hist. 



N. Y. iii. 127. 

 Chelonura serpentina, Say, Journ. Acad. Nat. Sci. Phila. iv. 217. — Holbr. N. Am. Herpet. 



1st ed. iv. 21, pi. 3; 2d ed. i. 139, pi. 23.— DeKat, N. Y. Fn. iii. 1842, 8, pi. 3, 



f. 6. 

 Emys serpentina, Gray, Syn. Rept. in Griffith's An. Kingd. ix. 14. 

 Chelydra serpentina, Harl. Med. & Phys. Res. 1835, 157. — Agass. Contrib. Nat. Hist. U. 



S. i. 1857, 417. And of most late authors.— Cope, Check List N. A. Bat. and 



Rep. 1875, 51. 

 Emysaurus serpentina, Dum:^r. & Bibr. Erp. G^n. ii. 350. — Stoker, Rep. Mass. , 



212. 

 Chelydra emarginata, Agass. op. cit. in text. 

 " Chelydra lacertina, Schw." (young). 

 " Testudo sei'rata, Penn." 

 " Testudo longicauda, Shaw." 



A species of remarkably extended distribution, from the Northern 

 border of the United States to South America ; not, however, in the 

 Pacific region. 



