^°|g^^^] Thirteenth Supplement to the A. O. U. Check- List. 41I 



THIRTEENTH SUPPLEMENT TO THE AMERICAN 



ORNITHOLOGISTS' UNION CHECK-LIST OF 



NORTH AMERICAN BIRDS. ^ 



At a session of the A. O. U. Committee on Nomenclature held 

 in Washington in April, 1904, the following rulings were adopted. 

 Departures from the nomenclature of the Check-List due to the 

 adoption by authors of the 12th instead of the 10th edition of 

 Linnaeus's ' Systema Naturae,' and those which are merely expres- 

 sive of personal preference or opinion, without the presentation of 

 new evidence, were not considered as requiring the formal reaffir- 

 mation of the Committee's previous rulings in such cases. 



Owing to the limited time at the Committee's disposal, and the 

 absence of the requisite material, many cases were deferred for 

 later action. In view of the present large number of these it was 

 decided to refer as many of them as possible to subcommittees for 

 investigation, with instructions to report thereon to the full Com- 

 mittee at its next session, which it is hoped can be so planned that 

 both time and material will be available to enable the Committee 

 to dispose of practically all of the cases then awaiting action. 



In preparing the present Supplement it has been deemed advis- 

 able to omit the secondary references to species and subspecies, 

 together with the concordance and geographical ranges, and also 

 the list of deferred cases. 



'J. A. Allen, Chairman. 



Charles W. Richmond, Secretary. 



William Brewster. 

 Committee. \ Jonathan Dwight, Jr. 



C. Hart Merriam. 



Robert Ridgway. 



Witmer Stone. 



1 Five Supplements have been issued since the publication of the Second 

 Edition of the Check-List in 1895, as follows : 



Eighth Supplement, Auk, XIV, Jan., 1897, pp. 1 17-135. 

 Ninth Supplement, Auk, XVI, Jan., 1899, pp. 97-133. 

 Tenth Supplement, Auk, XVIII, July, 1901, pp. 295-320. 

 Eleventh Supplement, Auk, XIX, July, 1902, pp. 315-342. 

 Twelfth Supplement, Auk, XX, July, 1903, pp. 331-368. 



