200 Proposed Changes in the A. O. U. Check-List. [April 



THIRD ANNUAL LIST OF PROPOSED CHANGES IN THE 

 A. O. U. CHECK-LIST OF NORTH AMERICAN BIRDS. 



BY HARRY C. OBERHOLSER. 



This is the Third Annual List of proposed A. O. U. Check-List 

 additions and changes in the names of North American birds. 

 Like the First and Second, 1 the present list comprises only orni- 

 thological cases, — i. c, such as require specimens or the identi- 

 fication of descriptions for their determination, and consists of 

 additions, eliminations, rejections, and changes of names due 

 to various causes. However, only changes known to be based on 

 revisionary work are included; therefore no mention is here made 

 of changes involved in names used without sufficient explanation 

 in local lists or elsewhere. 



This list is intended to include everything pertinent up to Decem- 

 ber 31, 1917, and nothing after that date has been taken. In view 

 of the volume and widely scattered character of current ornitho- 

 logical literature, it is not at all unlikely that some names have been 

 overlooked, and the writer would be very thankful for references to 

 any omissions, in order that such may be duly given a place in next 

 year's list. For assistance of this kind relating to the present list, 

 the author is indebted to Mr. F. Seymour Hersey, Dr. Charles 

 W. Richmond, and Mr. J. H. Riley. 



Fratercula arctica arctica (Linnaeus) becomes, in so far as North Amer- 

 ica is concerned, Fratercula arctica deleta (Briinnich). Alca deleta 

 Briinnich, Ornith. Borealis, 1764, p. 25 (Iceland). {Cf. Hartert, 

 British Birds, XI, No. 7, Dec. 1, 1917, pp. 163-166.) 

 fCoprotheres Reichenbach, Natiirl. Syst. Vogel, 1852 (1853), p. V 

 (type, Lestris pomarina Temminck). Recognized as a genus. {Cf. 

 Mathews, Birds Australia, II, pt. 5, Jan. 31, 1913, p. 497.) Includes 

 the following North American forms now in the genus Stercorarius: 

 Coprotheres pomarinus pomarinus (Temminck). 

 Coprotheres pomarinus camtschaticus (Pallas). 

 fCoprotheres pomarinus camtschaticus (Pallas). Catarractes cam- 

 tschatica Pallas, Zoogr. Rosso-Asiat., II, 1826, p. 312 (Kamchatka). 



i For the two previous lists, see The Auk, XXXIII, October, 1916, pp. 425-431; XXXIV. 

 April, 1917, pp. 198-205. 



t Additions to the A. O. U. Check-List, the Sixteenth Supplement and the First and 

 Second Annual Lists of Proposed Changes, are marked with a dagger (t). 



