38 CHECK-LIST OF NORTH AMERICAN BIRDS. 
RanGe.— North Pacific, Bering Sea, and adjacent Arctic Ocean, 
chiefly on Asiatic side. Breeds in Kamchatka and on Commander 
Islands; occurs casually at Herald Island, Port Clarence, Franklin 
Bay, and Aleutian Islands; winters to southern Japan. 
Larus occidentalis AupuBoN. Western Gull. [49.] 
Larus occidentalis AupuBON, Orn. Biog., V, 1839, 320. (Cape Disap- 
pointment, Washington.) 
RanGE.— Pacific coast of North America. Breeds from Washing- 
ton to southern Lower California; winters from Washington to south- 
western Mexico; casual in southern British Columbia; accidental in 
Colorado. 
[Larus affinis REINHARDT. Siberian Gull. [50.] 
Larus affinis REINHARDT, Videnskab. Meddelelser, 1853, 78. (Nenortalik, 
Julianehaab district, Greenland.) 
RanGE.— Northern Asia and Europe, south in winter to northern 
Africa; accidental in Greenland.] 
Larus argentétus PonropripaNn. Herring Gull. [51.] 
Larus argentatus PontoppipaNn, Danske Atlas, I, 1763, 622. (Denmark.) 
RancE.— Northern Hemisphere. In America breeds from south 
central Alaska, Melville Island, southern Ellesmere Land, and 
Cumberland Sound south to southern British Columbia, southern 
Alberta, northern North Dakota, central Wisconsin, southern Ontario, 
northern New York, and Maine, and in Europe south to northern 
France and east to White Sea; winters from southern British Colum- 
bia south to Lower California and western Mexico, and from Gulf of 
St. Lawrence and the Great Lakes south to the Bahamas, Cuba, 
Yucatan, and coast of Texas, and in Europe to Mediterranean and 
Caspian seas. 
[Larus vége PaLMEN. Vega Gull. [52.] 
Larus argentatus var. vege PALMEN, in NoRDENSKIOLD, Vega-Exped. 
Vetensk. Iakttag., V, 1887, 370. (Pidlin and vicinity, extreme north- 
eastern Siberia.) 
RanGE.— Bering Sea and adjacent Arctic Ocean. Breeds on north- 
ern coast of Siberia; south in winter to Japan.| 
