1887.] PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 117 



CONTRIBUTIONS TO THE NATURAL HISTORY OF THE COMMANDER 



ISLANDS. 



No. 7 — Revised and Annotated Catalogue of the Birds inhabiting the Com- 

 mander Islands. 



Ry I.EONHARD STO JIVEOER. 



(With three plates. ) 



Considerable material has accumulated since the author published 

 his "Eesults of Ornithological Explorations in Kamtschatka and the 

 Commander Islands" (U. S. Nat. Mus. Bulletin, No. 29), which has in- 

 duced him to prepare the present catalogue. Several species new to 

 the fauna have been added, and many doubtful points have been dis- 

 cussed in view of recent accessions to the museum collections. The 

 "conclusions" to be drawn will form another number of these "Con- 

 tributions." 



In regard to the following catalogue it may be remarked that the 

 nomenclature and arrangement is that of my "Eesults," &c.; the first 

 number preceding the specific name is the running number of the spe- 

 cies in this catalogue ; the number in parenthesis is the number of the 

 species in the Synopsis of the Birds of Kamtschatka ("Kesults," pp.313- 

 331); the figure following the specific name indicates the page on which 

 the species is treated of in detail in the "Kesults." The designations 

 of colors reter to Eidgway's " Nomenclature of Colors." The measure- 

 ments are in millimeters. 



COLYMBOIDE^. 



1 (1). Colymbus holbcellii (Reinh.) 11. 



A rare straggler. One specimen obtained on Bering Island Novem- 

 ber 24, 1882. 



2 (2). Colymbus auritus Lin. 14. 

 Eare straggler. 



ALCOIDE.E. 



3 (3). Urinator adamsii (Gray) 14. 

 Winter visitor only ; rather rare. 



4 (4). Urinator arcticus (Lin.) 313. 



By Taczanowski and Dybowski given as inhabiting Bering Island 

 (Bull. Soc. Zool. France, 1884, Extr. p. 3). It may occur during the mi- 

 grations only; in 1883, however, 1 was told of a "Bolschoj Gagara" 

 breeding at the Ladiginskij Lake, but I did not see it myself, nor did 

 the natives succeed in killing a specimen of wbat may possibly have 

 been this species. 



