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1 U.S. Geological Survey, Patuxent Wildlife Research Center, National Museum of Natural History, Washington, D.C., USA 2 3201 Circle Hill Road, Alexandria, Virginia, USA 3 Department of Biology, San Diego State University, San Diego, California, USA 4 Museum of Vertebrate Zoology, University of California, Berkeley, California, USA 5 24 Idaho Street, Bishop, California, USA 6 Florida Museum of Natural History, University of Florida, Gainesville, Florida, USA 7 Cornell Laboratory of Ornithology, Ithaca, New York, USA 8 Museo de Zoologia, Facultad de Ciencias, Universidad Nacional Autonoma de Mexico, Mexico D.F., Mexico 9 Michigan State University Museum and Department of Integrative Biology, East Lansing, Michigan, USA 10 Museum of Natural Science, Louisiana State University, Baton Rouge, Louisiana, USA 11 Department of Ecology and Evolutionary Biology, Ramsay Wright Labs, University of Toronto, Toronto, Ontario, Canada 12 Science and Education, Field Museum of Natural History, Chicago, Illinois, USA 13 University of Alaska Museum, Fairbanks, Alaska, USA * Corresponding author: chessert@si.edu; Chairman of the Committee on Classification and Nomenclature—North and Middle America, of the American Ornithologists’ Union. All authors are members of the Committee and are listed alphabetically after the Chairman.

Fifty-sixth Supplement to the American Ornithologists' Union:Check-list of North American Birds