292 REPORT OF COMMISSIONER OF FISH AND FISHERIES. 



Gillrakers few and short, the number usually not exceeding 25 and the 

 length of the longest about 4 times in diameter of eye. 



Color bluish above; sides silvery; under parts white; fins all plain, 

 except in breeding males, when they are tipped with black; adipose 

 fin and caudal frequently steel-blue in breeding males. The scales of 

 the male at the breeding season are covered with tubercles, which have 

 been described by Mr. Barton A. Bean as follows: 



Tlie tubercles on the scales at this time are very prominent, situated on the middle 

 of the scales, milk-white in color, and forming horizontal liues along the body from 

 head to tail. About 16 of these liues can be counted between the back and the 

 ventral edo-e of the body. The tubercles show on the abdomeu, but the color of 

 that portion of the body and of the tubercles being similar they are indistinct. 

 (Bull. U. S. Fish Conim. 1894, p. 55.) 



The following table gives comparative measurements of 37 specimens 

 of Coregonus williamsoni. 



Table of comparative measurements of specimens of Rocky Mountain whiteftsh (Coregonus 



williamsoni). 



No. 



186 



1ST 

 188 

 31 



Locality. 



98 

 103 



127 

 128 

 129 

 130 

 131 

 132 

 133 

 134 

 135 

 136 

 137 

 153 



154 

 155 

 156 

 157 

 158 

 159 

 160 

 161 

 162 

 182 

 183 

 184 



ShushwapLake, Sica- 

 mous, British Co- 

 lumbia 



....do 



....do 



Little Spokane River 



....do 



....do 



Outlet Alturas Lake, 

 Idaho 



....do 



Junction of Salmon 

 River and Alturas 

 Creek, Idaho 



do 



Outlet Alturas Lake, 

 Idaho 



Alturas Lake, Idaho. 



do 



.do . 



-do 



.do 



.do 



.do 

 do 

 do 



.do 



.do 



Payette River, a few 

 miles below Payette 

 Lake, Idaho 



do 



.do . 



.do . 



.do 



.do . 



.do . 



.do 



.do 



.do 



.do 



.do 



.do 



Snake River at Upper 



Salmon Falls, Idaho 



do 



4 4 

 4 4 



ii I 4 i 

 4 I 3J 

 4i H 

 ih 4 



2| 



9-84-8 

 10-87-8 

 10-87-8 

 10-87-8 



9-83-8 



Gillrakers. 



Number. 



In 



eye. 



7 + 15; 8+14 



9 + 15; 8 + 15 

 ? +12; ?+12 



10-85-8 

 10-78-8 



10-86-8 

 10-89-8 



10-85-8 

 10-90-8 

 10-86-8 

 10-78-8 

 10-78-8 

 10-84-8 

 10-87-8 

 10-92-8 

 10-85-8 

 10-82-8 

 10-82-8 



8 + 14; 8+13 

 7+12; 6+11 



10+15; 8 + 13 

 8+13; 8+12 



6 + 12 

 9+13 



8 + 10 

 10 + 14 



8+13 

 8+10 

 8+12 



9 | 12 

 8+14 

 9+14 

 9 + 15 

 7+13 



8+11 

 9+13 

 9 + 15 

 9+13 



8 + 12 

 8+11 

 8+11 

 7+15 

 10 + 15 

 8 + 14 

 8+15 

 7+13 



