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tion of the 7th edition of the Check-list of North American Birds (American Ornithologists’ Union [AOU] 1998). It summarizes decisions made by the AOU’s Committ ee on Classifi cation and Nomenclature—North America between 1 January and 31 December 2006. The Committ ee has continued to operate in the manner outlined in the 42nd Supplement (AOU 2000). Two new members were added to the committ ee in 2006— R. Terry Chesser and Irby J. Lovett e. Changes in this Supplement fall into the following categories: (1) two species are added because of splits in species already on the list (Anser serrirostris, Buteogallus gundlachii); (2) three species are added (two transferred from the Appendix) because of new distributional information (Oceanodroma hornbyi, Mesophoyx intermedia, Falco vespertinus); (3) the name of one species is changed because of a split from an extralimital species (Larus michahellis); (4) three generic names are changed, one because of a merger of genera (Spizastur into Spizaetus), two because of a splitt ing of genera (Megaceryle from Ceryle); (5) one English name is changed because of a split of the species (Anser fabalis) and (6) one species is added to the Appendix (Threskiornis aethiopicus). Further, one family (Cathartidae) is removed from the Order Ciconiiformes and returned provisionally to the Order Falconiformes, its traditional placement before 1998, although its true phylogenetic position remains uncertain.

FORTY-EIGHTH SUPPLEMENT TO THE AMERICAN ORNITHOLOGISTS’ UNION CHECK-LIST OF NORTH AMERICAN BIRDS