1. SALMO. 119 



Scarcely less doubtful is the S. gainlncrli, Suckley (Nat. Hist. 

 Wash. Terr. p. 331), noticed from two dried skins so much shrivelled 

 that they are evidently quite unlit for a scientific description. 



38. Salmo aurora. 



Fario aurora, Girard, Proc. Acad. Kat. Sc. Philad. 185G, p. 218 ; and 

 U. S. Pacif. R. R. Exp. Fish. p. 308, pi. 68. 



B. 11. D. 12. A. 13. 



The length of the head is one-fourth of the total (without caudal). 

 Maxillary extending beyond the orbit in a specimen 11 inches long. 

 Anterior margin of dorsal fin equidistant between the tip of the 

 snout and the base of the caudal. Caudal rather conspicuously 

 emarginate. Greyish silver}- above ; sides and belly yellowish orange ; 

 dorsal fin spotted (Girard). 



Astoria, Oregon Territory. 



39. Salmo gibbsii. 



Fario tsuppitch, Girard in Proc. Acad. Nat. Sc. Philad. viii. 185(3, 

 p. 218, and in U. S. Pacif. R. R. Exp. Fish. p. 310, pi. 69 (not 

 Richards.). 



Salmo gibbsii, Suckkrj, Ann. Lye. Nat. Hist. N. York,\'\\. 1858, p. 1. 



B. 12-13. D. 13. A. 14. 



Body elongated, compressed, fusiform in profile ; dorsal profile 

 but sKghtly arched ; snout rounded, the jaws subequal ; maxillary 

 gently curved, dilated posteriorl_y, and extending to a vertical Hue 

 passing slightly behind the orbit ; anterior margin of dorsal nearer 

 the extremity of the snout than to the insertion of caudal fin ; colours 

 of the head and back, in fresh specimens, rich dark olive-green, pro- 

 fusely dotted with roundish black spots, the scales in certain lights 

 showing bright silvery reflection ; the sides below the lateral line are 

 usually unicolor, of a yellowish white ; inferior fins unspotted ; tail 

 and upper fins yellowish olive, profusely spotted with round and oval 

 spots of black, each spot being from one to two lines in diameter, 

 and completely isolated from the others, not confluent as in some 

 other species ; caudal moderately lunated, not forked ; head small ; 

 teeth small, and very numerous, especially the labials. 



Kjiown from a single skin only, which appears to be much stretched ; 

 it is a female. Columbia River ; believed to be non-migratory. 



40. Salmo irideus. 



Salmo iridea, Gibbons, Proc. Cat. Ac. Nat. Sc. 1855, p. 36. 



rivularis. At/res, ibid. p. 43. 



Salar iridea, Girard, Proc. Acad. Nat. Sc. Philad. 1856, p. 220 ; and 

 U. S. Pac. R. R. Ftp. Fish. p. 321, pi. 73. f. 5, and pi. 74. 



B. 10. D. 14. A. 14. L. lat. 140. 

 Body rather stout, head of moderate size ; maxillary extending 

 beyond the vertical from the hind margin of the orbit in specimens 



