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[[image]] B.S. 22223. Marshy arroyo, haunt of shorebirds. Carhué, Buenos Aires, Argentina. December 15, 1920. [[image]] B.S. 22225. Nest and eggs of [[underlined]] Calopezus elegans. [[/underlined]] Carhué, Buenos Aires, Argentina. December 15, 1920. [[image]] B.S. 22228. View of rolling pampa with lagoon in distance. Carhué, Buenos Aires, Argentina. December 16, 1920.