598 



BULLETIN 50, UNITED STATES NATIONAL MUSEUM. 



the back, rump, and flauks irregularly striped or clouded with grayish 

 dusky; bill black, broadly tipped with dull yellowish. 



Adult male.—W'mg, 411-452 (437.6); taU, 172-186.5 (180.6); ex- 

 posed culmeii, 53.5-61.5 (58.3); tarsus, 61.5-70 (65.9); middle toe, 

 58-66 (62.2).« 



Adult female.— Wing, 413-414 (413.5); tail, 171-177.5 (174.2); ex- 

 posed culmen, 53.5-55 (54.2); tarsus, 61.5-63 (62.2); middle toe, 

 57-59 (58).^ 



Breeding from coast of Washmgton (Destruction Island; Carroll 

 Islet) northward along coast of British Colvmibia and Alaska, and 

 westward over Aleutian Islands to Commander Islands, Kamchatka, 

 thence northward to Pribilof Islands, Amak Island, and St. Lawrence 

 Island, Bering Sea. Providence Bay, Siberia, and Noatak Bay, and 

 Cape Denbigh, Alaskan mainland; migrating southward along Pacific 

 coast of United States as far as Guadalupe Island, Lower California, 

 and on Asiatic side to Japan (Hakodate). 



[?] Larus glaucopterus Kittlitz, in Lutke's Voy. 'Seniavine,' French trans- 

 lation, iii, ISSfi, 272, 280 (I'na'.aska); Denkw., i, 1858, 259, 335. 



[Larus] glaucopterus Lichtensteix, Xom. Av. Mus. Berol., 1854, 99 (Bering 

 Strait). 



Larus glaucopterus Schalow, Journ. fiir Orn., 189], 263 (Sitka and Unalaska, 

 Alaska). 



[?] [Laroides] glaucopterus Bonaparte, Xaumannia, 1854, 211 (Kamchatka"). 



L[urus] glaucescens Naumann, Vog. Deutschi., x, 1840, 351 (Xorth America: coll. 

 Berlin Mus.). 



Larus glaucescens Lawrexce, in Baird, Rep. Pacific R. R. Surv., ix, 1858, 842. — 

 Kittlitz, Denkw., i, 1858, 259, 285, 3.35.— Baiud, Cat. N. Am. Birds, 1859, 

 no. 657.— CouES, Proc. Ac. Nat. Sci. Phila., 1862, 294 (monogr.): Check List, 

 1873, no. 545; 2d ed., 1882, no. 770; Birds Northwest, 1874, 622 (monogr.).— 

 DALLand Bannister, Trans. Chicago Ac. Sci., i, 1869, 304 (Sitka and Kodiak, 

 Alaska). — Elliot, New and Unfig. N. Am. Birds, i, 1869, Introd. (wing 

 figured and name transposed). — Finsch, Abh. Nat. Ver. Brem., iii, 1872, 83 

 (Alaska).— Dall, Proc. Calif. Ac. Sci., v, 1873, 32 (Aleutian Islands, resident; 

 habits, etc.); v, 1874, 278 (Kyska Island, Aleutians, breeding).— Swinhoe, 

 Ibis, 1874, 165 (Hakodate, Japan). — Blakiston and Pryer, Ibis, 1878, 217 



a Ten specimens. 



&Two specimens. 



I.oralilv. 



MALES. 



Seven adult males from Alaska , 



Two adult males from Washington (June) 



One adult male from I'ering Island, Kamchatka (.Tune) 



FICMAI.E.S. 



One adult female from Alaska (Sitka, .Tune) 



One adult female from I'ering Island (June) 



Mid- 

 dle 

 toe. 



61.9 

 64.5 

 59.5 



59 

 57 



