^"'igoT^] Eleventh Sufplemoit to A. O. U. Check-List. 315 



ELEVENTH SUPPLEMENT TO THE AMERICAN 



ORNITHOLOGISTS' UNION CHECK-LIST OF 



NORTH AMERICAN BIRDS. 1 



The Committee met in Washington, April 17 to 23, All the 

 members were present and took part in the work, four of them 

 continuously, and three of them during the greater part of the 

 session. Its work was greatly facilitated by previous reference 

 of a large part of the questions to subcommittees, which sub- 

 mitted reports for the information and consideration of the com- 

 mittee on the special questions assigned them for investigation. 



As at previous meetings of the Committee, it was found nec- 

 essary to defer many cases owing to lack of material for their 

 satisfactory investigation. All questions affecting the status of 

 genera, subgenera and higher groups were again deferred. As 

 heretofore, discrepancies in nomenclature arising from taking 

 the 12th instead of the loth edition of Linnaeus's ' Systema 

 Naturae', and cases already settled by the Committee and raised 

 merely as the expression of an author's opinion or preference, 

 without the presentation of new evidence adverse to the Com- 

 mittee's ruling, were regarded as not requiring reinvestigation. 



Several cases of generic names, where the substitution of one 

 name for another depends on whether a name is tenable when 

 merely an orthographical variant of another, were deferred for 

 special consideration at the next meeting of the Committee, to be 

 held in Washington next November. 



" C Hart Merriam, Chairman. 



J. A. Allen. 



William Brewster. 

 Committee -\ Jonathan Dwight, Jr. 



Charles W. Richmond. 



Robert Ridgwav. 

 ^Witmer Stone. 



^ Three Supplements have been issued since the publication of the Second 

 Edition of the Check-List in 1895: 



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

 Ninth Supplement, Auk, XVI, 1899, PP- 97~'33- 

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



