La.x^-0 - S<-^ 



SMITHSONIAN INSTITUTION 



UNITED STATES NATIONAL MUSEUM 

 Bulletin 133 



OBSERVATIONS ON THE 



BIRDS OF ARGENTINA, PARAGUAY, 



URUGUAY, AND CHILE 



BY 



ALEXANDER WETMORE 



Assistant Secretary, Smithsonian Institution 



WASHINGTON 



GOVERNMENT PRINTING OFFICE 

 1926 



