SUCKLEY MONOGRAPH OF THE GENUS SALMO. Ill 



thus (LnUieed are probably' much unlike those of the adult iu good con- 

 dition. 



Sp. Cil. — " 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 

 fi\^e extreiuity 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 tlie cauilal fin. Bluish-gre^' above; silvery along the mid- 

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



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

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

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

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

 oil 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 certainty to what species 

 they really belong. Iu many characters they resemble the 8. quinnat, 

 and particularly so in having fully fifteen brauchiostegal rays. 



12. SALMO PAUCIDEXS, Richardson. 



WEAK-TOOTHED SALMON. 



Syx. — Salmo 2)iiMcidi')is, Rich. F. B. A. iii, p. 222; — Heubkrt, Sup. to Fish <aiid 

 Fisbiug, &c. 18.50, p. 38;— Suckley, Nat. Hist. Wasli Terr, and P. II. 

 E. Reports, vol. xii, p. 325, 1859-'{>0. 



Dr. Girard's species, the S. 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 labeled by the doctor as 8. 

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

 induce us to consider the latter name only as a synouj^m. The young 

 of ail 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. Kennerly's collection from Frazer River, labelled 

 the sul:-l<egh, and described by us in " Il^otices of Several New Species 

 of Salmonidie, &(*., Xew York, June, ISOl," as the Salmo richardi, comes 

 nearer to this species than any that we have received trom the Pacific 

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

 bia will settle the question. 



For discussion of certain points in connection with S. j>aucidens, we 

 refer to the works last quoted in the synonymy above. 



13. SALMO TSUPPITCH, Richardsou. 



WHITE SALMON. 



Syx. —Stthno Unppitch, Rich. F. B. A. Fi^ilies, 1836, p. 221 ;— De Kay, X. Y. Fauna, 

 iv, 1642; — Stokek, Synop. 1846, p. 197; — Hekueut, Supplem. to Fish 



