PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 81 



The scales in Cristivomer are quite small, aud the species are graij- 

 spotted. There are probably but two species, Cristivomer namaycush * 

 (Walbaum) and Cristivomer siscoivet (Agassiz). 



The species of SalveUnus known witliiii the limits of the United 

 States arc compared below. The species from British America, Salve- 

 linus stagnalis (Fabricius) (= *S\ nitidus aud S. alipes Rich.), S. ro.ssi Rich., 

 S. hoodi Rich., S. lordi Giinther, ;8. arcturus GUnther, and S. tudes Cope, 

 I have not seen. Most or all of them are probably valid. Salvelinus 

 bairdi, of the Pacific coast, is very near Salrelinus fontinalis, and may 

 be a variety of it; but never having- seen it in life, I am not by any 

 means prepared so to consider it. 



Common characters .—River Salmon, not auadroiuous, with the vomer boat-shaped, some- 

 what carinate below; a few teeth on the posterior part of the ehevron ; none 

 on the depressed shaft: scales very small, more or less imbedded in the skin, 

 in 200-'ir)0 transverse series, those of the lateral line considerably enlarged ; 

 fins moderate, the last ray of the dorsal not lengthened, shorter than any of the 

 other developed rays ; caudal fin rather short, usually but little cmarginato in 

 the adult, forked in the young : sides of the body with round red spots ; lower 

 fins with a pale marginal band anteriorly, succeeded by a darker band ; in sea- 

 run specimens, these spots and other markings are often obliterated, and a 

 more or less uniform silvery tint prevails: species not of the largest size, the 

 sexual peculiarities not very strongly marked, the adult male usually with a 

 fleshy projection at the tip of the lower jaw, which fits into a slight emaxgi- 

 uation of the upper jaw. 

 a, Hyoid bone provided with a median band of teeth. 

 ft. Body elongate, slender, considerably compre.ssed, the depth about .20 of the 

 length of the body: caudal peduncle long and slender: head quite small, .21 

 of length of body; its upper surface flattish, A'Sl of length, the interorbital 

 space about .07 : mouth quite small, the maxillary short and moderately 

 broad, .08 of length, not extending to the posterior margin of the eye ; man- 

 dible .12 of length ; snout, .05: scales quite small, in about 230 transverse 

 rows : caudal fin well forked ; adipose fin rather small : coloration dark blue, 

 the red spots confined to the sides of the body, round, smaller than the pupil : 



hyoid teeth numerous, small. Lakes of Maine OQOASSA.t 



ib. Body stout, not greatly compressed, the back elevated, the depth .24 of the 

 length: head large, stout, broad, and flattened above, about .28 of length, its 

 upper surface .17 of length, the interorbital space .08 : mouth large, the max- 

 illary extending beyond the eye .11 of length ; the mandible, .16 ; the snout, .07 : 

 hyoid bone with very few (3 or 4), rather strong teeth (sometimes deciduous) : 

 fins short, the caudal slightly forked ; adipose fin unusually large, its length 

 in adults nearly twice that of the eye : scales very small, in about 240 trans- 

 verse rows : red spots on the sides quite large, about the size of the pupil : 

 back covered with very distinct spots, similar to those on the sides, but rather 

 smaller, the dorsal spots said to be cream-colored or greenish in life, rather 

 than red. Streams west of the Sierra Nevada spectabilis. 



* Namaycush Salmon, Pennant. — Sahno namaycush Walbaum, 1792, = Salmo namaycmk 

 Bloch, 1801,= Salmo paUidus Rafinesque, 1817, = Sahno amethystus Mitchill, lSl8, = Salmo 

 covfinia DcKay, = Salmo symmetrica Prescott, 1851 , = Salmo adarondaciis Norris, 1864, =^ 

 Salmo toma Hamlin, 1863. 



i Salvelinus oquassa (Girard) Gill & Jordan. — Sahno oquassa, Giranl, 1854. 



Proc. Nat. Mus. 78 G August 6, 1 878. 



