THIRD SUPPLEMENT TO THE AMERICAN ORNITH- 
OLOGISTS’ UNION CHECK-LIST OF 
NORTH AMERICAN BIRDS. 
By orpeER of the Council of the American Ornithologists’ 
Union the Committee on Publication has prepared the following 
report on the species, sulspecies, and changes of nomenclature 
proposed during the year ending November, 18go, to be pub- 
lished as the Third Supplement to the American Ornithologists’ 
Union Check-List. 
In accordance with the action of the Council, the Committee 
in cases of the rejection of proposed changes or additions, gives 
its reasons for considering them inadmissible. 
A few cases are necessarily deferred from lack of the requisite 
data to enable the Committee to reach satisfactory decisions. 
The Council having passed a standing order for the preparation 
