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[[image]] B.S. 22229. View across rolling open pampa. Carhué, Buenos Aires, Argentina. December 16, 1920. [[image]] B.S. 22230. Nest of large water rat in rushes. Carhué, Buenos Aires, Argentina. December 18, 1920. [[image]] 1435. Nesting site of Misto, [[underlined]] Sicalis arvensis [[/underlined]], in tall grass. Carhué, Buenos Aires, Argentina. December 18, 1920.