SUCKLEY MONOGRAPH OF THE GENUS SxVLMO. Ill 



thus deduced are probably much unlike those of the adult in good con- 

 dition. 



Sp. Ch. — "Body very much depressed, rather deep upon its middle 

 region, and quite tapering posteriorly. Head moderate, constituting the 

 fifth of the entire length. Jaws equal. Maxillary slightly curved; its 

 free extremity extending to a vertical line drawn posteriorly to the orbit. 

 Anterior margin of dorsal fin nearer the extremity of the snout than the 

 insertion of the caudal fiu. Bluish-grey above; silveiy along the mid- 

 dle of the flanks; yellowish beneath." — Girard. 



Three specimens are in the Smithsonian collection, labeled by Dr. 

 Girard, as belonging to this species. From two of these, also, he based 

 Ms description, and had the drawing of Plate Ixx, Gen. Rep. Fishes, 

 P. R. R. Rept,, made. They are alcoholic specimens, and are numbered 

 on the museum register 579, 580. 



The least examination shows that both were very young fish — so 

 young as to render it impossible to decide with certaiuty to what species 

 they really belong. In many characters they resemble the >S'. quiuiiat, 

 and i)articularly so in having fully fifteen branchiostegal rays. 



12. SALMO PAUCIDENS, Richardson. 



WEAK-TOOTHED SALMON. 



Syn. — SaJmo paueidens, EiCH. F. B. A. iii, p. 222; — Herbert, Sup. to Fisli and 

 Fishing, &c. 1850, p. 36;— Stickley, Nat. Hist. Wasli Terr, and P. R. 

 E. Reports, vol. xii, p. 325, 1859-'G0. 



Dr. Girard's species, the 8. aurora., has the back well arched. This 

 may be owing to youth. Were it not for this circumstance the exceed- 

 ingly small, weak teeth of the specimens hibeled by the doctor as S. 

 aurora, (and from which he based his description of the species) would 

 induce us to consider the latter name only as a synonym. The young 

 of all the species of salmon known to the writer have forked tails, and 

 it is, therefore not until the fish have reached adult age that this charac- 

 ter can be relied on as specific. 



The salmon in. Dr. Keunerly's collection from Frazer River, labelled 

 the suJi-lcegh, and described by us in " Kotices of Several New Species 

 of Salmouidte, &c., Xew York, June, 18G1," as the Salmo richardi, comes 

 nearer to this species than any that we have received ti'om the Pacific 

 coast, even including the S. aurora. More specimens from the Colum- 

 bia will settle the question. 



For discussion of certain i^oints in connection with S. paueidens^ we 

 refer to the works last quoted in the synonymy above. 



13. SALMO TSUPPITCH, Richardson. 



WHITE SALMON. 



Syn.— .S'«?/yiO hupi)itch, Rich. F. B. A. Fishes, 1836, p. 224 ;— De Kay, N. Y. Fauna, 

 iv, 1842; — Storer, Synop. 1846, p. 197; — Herbert, Supplem. to Fish 



