684 ZOOLOGY— FISHES. 



vada, Montana, and Colorado ; and 8. spilurus of Western Colorado and 

 New Mexico. These all belong to the group Salar. 



The following brief synopsis of the Salmonidcc of the regions under dis- 

 cussion may prove useful for purposes of identification : 



Depth 5.75 in length ; eye 4.5 times in head ; snout obtuse ; caudal fin 

 scarcely emarginate ; Br. IX - S. virginalis. 



Depth 4.75 in total (to point of caudal) ; eye 5 times in head ; muzzle acute ; 

 scales larger, 26 below dorsal fin ; cranium not keeled above ; head 

 one-fourth length ; dorsal fin nearer muzzle than end of caudal scales ; 

 caudal fin scarcely emarginate ; Br. X 8. spilurus. 



Head large, broad, flat, not keeled, 4.25 in total, equal depth of body ; muz- 

 zle obtuse ; eye nearly 5 times in head ; scales 42 below first dorsal 

 ray ; dorsal fin equidistant ; caudal fin not notched 8. stomias. 



Head smaller, 4 times in length to notch of caudal (which is well emargin- 

 ate) ; upper surface keeled ; muzzle obtuse ; eye 4 times in length ; 

 depth 4.5 in length to end of caudal scales ; dorsal midway between 

 latter and end of muzzle ; scales small, 40-43 below dorsal first ray ; 

 Br. XI & plenriticus. 



Head acuminate, keeled above 4.66 times in length to notch of caudal fin, 

 which is well marked ; eye 0.2 of head ; depth 5.25 to caudal notch ; 

 dorsal nearer muzzle than end of caudal scales ; scales large, 33 below 

 dorsal first ray ; spots large, distinct ; Br. XII : . .8. carinatus. 



Head ^ total length ; eye 5 times in head ; dorsal fin equidistant between 

 insertion of caudal and end of muzzle ; muzzle rather pointed ; Br. 

 X-XI - 8. irideas. 



8. spilurus and S. carinatus, of those above enumerated, are readily dis- 

 tinguishable by their smaller orbits and large scales ; as in 8. stomias and S. 

 pleuritkus the scales are quite small in comparison. But it should be men- 

 tioned that 8. carinatus and 8. pleuritkus resemble each other in the presence 

 of the strong median carina on the superior aspect of the cranium. S. sto- 

 mias may be readily known by the large mouth and head. Its habitat, as 

 far as known, is the Kansas River, far to the eastward of the Rocky Mount- 

 ains. 



