UNITED STATES 

 DEPARTMENT OF THE INTERIOR 

 Walter J. Hickel, Secretary 



BUREAU OF SPORT FISHERIES AND WILDLIFE 

 John S. Gottsohalk, Director 



United States Government Printing Office • Washington • 1969 



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

 Washington, D.C. 20402 - Price $1 



North American Fauna, Number 66 



Published hy 

 Bureau of Sport Fisheries and Wildlife 

 April 1969 



