ISOPONDYLI COKEGONIDAE COREGONCS VILLIAMSONII. 683 



of the dorsal. Colors in life, bluish neutral tint above, silvery-white be- 

 neath. 



Radii : Br. 8-8 ; D. 1-12 ; A. 1-12 ; C. 5, 1, 9, 8, 16 ; V. 2-12-12 ; P. 

 2-16-16. 



The specimens from the Provo River correspond generally with Girard's 

 specimens, but there appears to be an exaggeration in the size of certain 

 parts, notably the adipose fin, and maxillary bone ; in short, the whole physi- 

 ognomy of our specimens differs in being much larger. This appearance 

 may, perhaps, be due to the fact that Girard's specimens were very old, and 

 have contracted greatly during their twenty years' preservation in alcohol ; 

 ours are comparatively fresh. 



This fish, belonging to the Puget's Sound fauna, we in vain endeav- 

 ored to find at Provo, in July, 1872, and it was not until November that 

 we succeeded in procuring specimens. At this time, many were being- 

 taken with hook and line, and we were informed it is seldom taken in any 

 other way. Occasional stragglers find their way to the lake, and are then 

 taken with trout, but this seldom occurs. They go far up the mountain 

 streams to spawn, but the time could not be ascertained. It is probably 

 early in summer, as no fish were heard of below Provo Canon in July. 

 They are frequently taken eighteen inches in length. The average price is 

 twenty cents per pound, and they are highly esteemed for the table. This 

 fish is also found high upon the Sevier to the southward, but is by no 

 means so numerous as in the Provo River. 



SALMO, Linn. 



Of this genus, quite a number of species are found in the lakes and 

 streams of the Rocky Mountains, and are very nearly allied : Salmo virgi- 

 nalis being the characteristic fish of the lakes of Utah ; S. pleuriticus of Ne- 



