UNITED STATES 

 DEPARTMENT OP 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 

 John S. Gottschalk, Director 



North American Fauna, Number 67 

 Published hy 

 Bureau of Sport Fisheries and Wildlife 

 May 1969 



U.S. GOVERNMENT PRINTING OFFICE 

 WASHINGTON : 1969 



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

 Washington, D.C. 20402 - Price 60 cents 



