UNITED STATES DEPARTMENT OF THE INTERIOR, STEWART L. UDALL, SECRETARY 

 Fish and Wildlife Service, Clarence F. Pautzke, Cominissioner 

 Bureau of Sport Fisheries and Wildlife, Daniel H. Janzen, Director 



NATURAL VARIATION IN SPOTTING, HYOID TEETH COUNTS, 



AND COLORATION OF YELLOWSTONE CUTTHROAT TROUT, 



Salmo clarki lewisi Girard 



By 



Ross V. Bulkley 



Special Scientific Report--Fisheries No. 460 



Washington, D. C. 

 July 1963 



