UNITED STATES 

 DEPARTMENT OF THE INTERIOR 

 Walter J. Hickel, Secretary 



Leslie L. Glasgow, Assistant Secretary for 

 Fish and Wildlife, Parks, and Marine Resources 



FISH AND WILDLIFE SERVICE 

 Charles H. Meacham, Commissioner 

 BUREAU OF SPORT FISHERIES AND WILDLIFE 



North American Fauna, Number 68 

 Published by 

 Bureau of Sport Fisheries and Wildlife 

 August 1969 



U.S. GOVERNMENT PRINTING OFFICE 

 WASHINGTON : 1969 



For sale by the Superintendent of Documents, U.S. Government Printing 

 Office Washington, D.C. 20402 Price $1.75 



John S. Gottschalk, Director 



