PKOCEEDINGS OF UNITED STATES NATIONAL MUSEUM. iO 



f. " Head largo, broad, llat, not keeled, 4.25 in total length, equal to depth 

 of body : imizzlo obtuse: eye nearly 5 times in head : scales (small, as 

 in var. I'^fiiriiicitfi) 4'2 below tirst dorsal ray: dorsal tin equidistant: 



caudal tiu not notched. Kansas River." — (Cope.) stomias.* 



ff. Head comparatively large, and long acuminate, .25 of leugth, its outline 

 as a whole pointed, but the muzzle itself bluntish, its upper surface 

 not much convex in either direction, very slightly carinated: mouth 

 medium, thw maxillary moderate, .12 of length, not reaching much 

 beyond eye: patch of hyoid teeth sm;ill, and comparatively weak: 

 body elongate, not greatly compressed, the depth .25 of leugth : 

 dorsal fiu small, its last rays J the height of the lirst: caudal tiu 

 short, quite distinctly forked: scales small, in 1(30 to 184 transverse 

 rows: colors rather dark, back and sides more or less profusely 

 covered with suiall rounded spots. Streams of California west ol 



the Sierra Nevadas; Lake Tahoe ilKNsiiAWi.t 



fff. Head comparativt ly short and thick, .22 to .25 of length, its outline 

 more convex, more or less distinctly carinated above : moulh rather 

 small, but larger than in irideiis, the maxillary not reaching far be- 

 yond the eye : patch of hyoid teeth well developed : body moderj.telj^ 

 elongate, compressed; depth .24 of length: dors.l fiti rather low, 

 its last rays 3 the height of the first: caudal fin scarcely forked, 

 rather more so than in spilurus: scales moderate or rather small: 

 ^colors variable, the back and sides usually profusely, but variablj' 

 spotted, silvery in sea-run individuals. Rio Grande to Upper Mis- 

 souri and west to the Pacilic ci.arki. 



J/. Scalys moderate, in 155 to 1(55 rows ; chiefly west of the Rocky 

 Mountains Subsi)ecies clarkl. 



yij. Scales small, in 165 to 170 rows: chiefly east of the Rocky Mount- 

 ains Subspecies aurora. 



The ximeiicau species of this stibgenus Salar are very closely inter- 

 related, and mijifht almost be considered as varieties of a single poly- 

 morphous species. The occurrence of forms ap[>.irently intermediate 

 prevents me from considering aurora and pleuriticus as distinct species, 

 although they may usually be readily recognized. 



Of the true subgenus ISaimo^ tliere seems to be but one species in 

 America, the ISahao salur, our specimens being, so far as I can see, pre- 

 cisely identical with the European. The laud-locked Salmon of Maine, 

 Salmo sebago, Girard, does not differ by any constant character from 

 Saliito salar, and its pt'rmaneut residence in fresh water is the only 

 character of which I know on which a subspecies sebago conhl be based. 

 Landlocked Salmon from Bergen, Sweden, in the United States National 

 Museum, and laud-lockcd Salmon from Sysladobsis Lake, Maine, are to 

 my eye precisely alike, and both are Salmo salar^ Linnajus. 



* Salmo stomias Copo, 1872. — I have not seen this species, but Professor Cope writes 

 me that if I had, I would certainly consider it specifically distinct from S. j>lvuriticuti. 

 Since the above, was in typ ■, I have examined a head of a large sp cimen of Salmo 

 'itomia.s from the Upper Missouri. It agrees fully with Professor Cojx 's description. As 

 it is a si)ecies with well-developed hyoid teeth, it is related to *S'. darkl, ■A\\i{ S.lien- 

 xhaivi, differing in the peculiar form of the head and the smaller size of the scales. 



t Salmo henshawi Gill & Jordan, Jordan, Man. Vert. ed. 2d, p. 358, 1878. — This fine 

 species is named in honor of Mr. II. W. Henshaw, the well-known ornithologist, who 

 first brought .specimens from Lake Tahoe. 



