SUCKLEY MONOGRAPH OF THE GENUS SALMO. 113 



ash-gray; end of caudal pausj-purple. Back, dorsal, and caudal stud- 

 ded witk small semi-Umar spots. A large patch of arterial-red ou the 

 operculum and margin of pre-operculum. Pectorals, ventrals, and anal, 

 grayish-white, tinged with rose red." 



Bmjs.— ''Br. 11; P. 12: V. 8: A. 13: D. 11-0." The original speci- 

 mens were obtained by Dr. Gairdner at the Oathlapootl Ilivel-, a small 

 tributary to the Columbia. None have been obtained during the recent 

 explorations, although it is by no means improbable that some one of 

 the species lately described from healthy-run individuals may reall^^ be 

 identical with this fish. For further remarks and suggestions concern- 

 ing S.cJar1:ii, see "i^at. Hist. Washington Territory," or Pacific E. R. 

 Reports, vol. V2. 



15. SALMO IMMACULATUS, Storer. 



THE UNSPOTTED SALMON. 

 8yx. — Sahno immaculaius, H. R. SxoitER. Bost. Joiirn. Nat. Hist., vi, pp. 264-1169. 



Sp. Ch. — (Drawn from Storer's original description.) " Length of head 

 about one-sixth that of the body ; its depth two-thirds of its length. 

 Jaws with numerous sharp incurved teeth. Eyes laterally elongated, 

 their diameter one-third the distance between them. Opercles rounded 

 posteriorly ; beloAv, naked and marked with concentric stritie. Pre-opercle 

 la^rger than in S.fontinaJis. 



Scales larger than those of S. fonthialis. Lateral line commences 

 back of superior angle of the operculum, and assuming the curve of the 

 body is lost at the commencement of the caudal rays. The first dorsal 

 commences just anterior to median line, and is nearly quadrangular. 



Fins. — Adipose at a distance back of the first dorsal little less than 

 one-half the length of the fish. Pectorals just beneath posterior angle 

 of the operculum ; their length three-fifths that of the head. Yentrals 

 just beneath posterior portion of first dorsal. The plates, at their base, 

 very large ; anal about the length of the head behind the ventrals, ter- 

 minating directly beneath the adipose fin. Caudal deeply forked, its 

 length equal to greater depth of body. 



Colo)^. — Silver}^ on sides and abdomen ; darker on back. ]S"o spots. 



DiAaNOSis. — The diagnosis betweeii this species, if it should really 

 prove distinct, would be by the following : Its silvery color ; absence of 

 spots ; great length of head compared to the body, the strongly forked 

 tail and its great length. " D. 9 : P. 13 : V. 9 : A. 11 : C. 30." ' 



The specimen described by Dr. Storer appeared to be unique. Its 

 length was thirteen and a half inches, and trom that circumstance, and 

 from the deeply-forked tail, I am strongly inclined to consider it as that 

 of a young fish, probably belonging to some species already known — 

 perhaps ^8'. truttq. The naming of salmonidae, and the description of 

 new species, based upon the characters of young, partially developed 

 fish, cannot be too strongly reprobated. There is already too much 

 confusion in the synonymy of the various kinds; and if the jiractice of 

 S. Mis. 74 8 



