306 Notices of CeTiain Species of 



XXX. — Notices of certain New Species of North American 

 Sahnonidm^ chiefly in the Collection of the N W. Boundary 

 Commission^ in charge of Archihald Campbell^ Esq.^ Com- 

 missioner of the United States, collected hy Doctor G. JB. H. 



' Nenfierly, Naturalist to the Commission. 



By Geokge Sucklet, M.D., Late Assistant Surgeon, U. S. Army. 

 Read June, 1861. 



Owing to the unfortunate deatli of Dr. Kennerlj on Iiis return 

 from a three years' exploration, the preparation of a report on 

 certain of the material collected by him was assigned to me. 

 In the course of this undertaking I have prepared a copious 

 synopsis of the species of American Salmon and Trout, to 

 appear in the final Report of the Commissioner. It has been 

 thought best to issue in advance brief descriptions of the species 

 hitherto unnamed. 



Nothing is more difficult than the naming of different species 

 of the Salmonidge from individual peculiarities, scarcely one 

 constant character being ever found confined to a single kind, 

 so that in the determination of the species we are obliged to 

 rely iipon an aggregation of characters and their modifications. 

 In man}'- instances this difficulty has been got over readily, 

 and in a very satisfactory manner to the author, by applying 

 the names of gentlemen who have directly or indirectly shown 

 their interest in aiding Dr. Ivennerly in his pursuits, or the 

 author in his preparation of this report. In this paper, — another 

 published in the Annals of the N.Y. Lyceum, — and a report by 

 the author on the Salmonidse of the N. W. coast of America, 

 printed in the 12th volume Pacific R. R. Reports, and dupli- 

 cated in the "Natural History of Washington Territory," 

 nearly everything hitherto printed relating to the species of 

 Salmon and Trout found on the Pacific slope is embodied — 

 with the exception of certain details contained in Sir John 

 Richardson's Fauna Boreali Americana, and in a few other 

 papers to be referred to in the more extended report. 



