ART. XI.-NOTES ON THE HERPETOLOGY OF DAKOTA 

 AND MONTANA. 



By Drs. Elliott Coues and H. C. Yarrow. 



The present article is based primarily upon a collection of Eeptiles 

 and Batrachians made in Dakota and Montana in 1873-74 by Dr. 

 Coues, as Naturalist of the United States Northern Boundary Commis- 

 sion. 



In identifying these specimens, the authors have diligently compared 

 them with other material from the same geographical area in the 

 Natioual Museum, and have added to the species collected by Dr. Coues 

 others known to occur in the region under consideration, thus present- 

 ing a tolerably complete list of the Eeptiles and Batrachians of the 

 two Territories. No species is introduced that is not fully identified 

 and determined to inhabit this portion of the United States. Care has 

 been taken with the synonymy to exclude doubtful references, except 

 in one or two instances. The descriptions are drawn directly from the 

 specimens, and considerable matter of popular interest has been intro- 

 duced. The nomenclature and classification are mainly according to 

 Professor Cope's recent Check List, though the authors have not hesi- 

 tated to differ from this authority on occasion. 



A.-REPTILIA. 

 CHELONIA. 



Family EMYDID^. 



Genus CHEYSEMYS. Gray. 



Chrysemys oregonensts. {Harlan) Ag. 



Oregon Golden Turtle. 



Emys oregonensis, Harl. Am. Journ. Sci. xxxi. 382, pi. 31. — Holbr. N. Am. Herpet. i. 



, 107, pi. 16.— DeKay, N. Y. Fn. iii. 1842, 20. 



Chrysemys oregonensis, Ac. Contr. Nat. Hist. U. S. i. 1857, 440, pi. 3, f. 1-3. — Bd. U. S. 



Mex. B. Surv. ii. pt. ii. 1859, Reptiles, 4 (Texas). — Allen, Proc, Bost. Soc. N. 



H. xvii. 1874, 68 (Fort Eice, Dakota). 



Specimen. 

 1096. Mouse River, Dakota. Aug. 30, 1873. 



Shield Eeptiles are not well represented in the region surveyed by 



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