1423. B. S. Donaldson, Estancia Los 
Yngleses, Lavalle, Buenos Aires, Argentina. 
November 10, 1920. 
B.5. 22169. Nest of ovenbird 
or hornero (Furnarius rufus) on 
gate that is used daily. Lsvalle, 
Buenos Aires, Argentina. 
November 11, 1920. 
B.S. 22171. Tidal flats at mouth 
of Rio Ajo. Lavalle, 3uenos Aires, 
Argentina. 
Noveirber 15,1920. 
