SMITHSONIAN MISCELLANEOUS COLLECTIONS 

 VOLUME 146, NUMBER 6 



A REVISION OF THE 



AMERICAN VULTURES 



OF THE GENUS CATHARTES 



By 



ALEXANDER WETMORE 



Research Associate, Smithsonian Institution 



(Publication 4539) 



CITY OF WASHINGTON 



PUBLISHED BY THE SMITHSONIAN INSTITUTION 



AUGUST 14, 1964 



