164 NORTH AMERICAN FAUNA 61, FISH AND WILDLIFE SERVICE 



Yukon and western Mackenzie." It is entirely possible that the 

 breeding range extends much farther east. Among specimens 

 examined, L. h. hyperboreus was found to the westward across 

 northern Eurasia, Greenland, and northeastern North America 

 as far west as Baffin and Ellesmere Islands. In any case, it may 

 be expected that many of the birds can find their way from 

 Arctic Canada to the Atlantic coast in winter. The gulls are far- 

 ranging birds. Steller's eider has been recorded from the Gulf 

 of St. Lawrence (Fisher 1900). 



It seems logical to consider Larus h. hyperboreus a& breeding 

 throughout the Arctic regions of Siberia and Europe, traveling as 

 far west as Baffin and Ellesmere Islands (and probably neighbor- 

 ing areas) and, from the west, traveling eastward to the Bering 

 Sea coast of Siberia. In Bering Sea, the birds obviously have 

 come eastward as far as St. Matthew and Walrus Islands. There 

 is a specimen from St. Matthew taken by G. D. Hanna on July 

 9, 1916. Gabrielson obtained a breeding specimen on St. Matthew 

 Island in the summer of 1940. He noted particularly that the 

 breeding colony consisted of birds obviously larger than the 

 glaucous-winged gulls. It may be remarked that the size of the 

 average barrovianus is not far different from glaucescens, includ- 

 ing the size of bill. Therefore, the birds noted on St. Matthew 

 Island by Gabrielson would be the larger hyperboreus. 



Thus, L. h. barrovianus has a breeding range that includes the 

 Bering Sea coast of Alaska and the Arctic coast of Alaska and 

 Canada eastward, possibly across most of the Northwest Terri- 

 tory. Collections of breeding specimens would aid in this determi- 

 nation. There are indications that the two forms meet in the 

 Pribilofs, for there is an immature bird from St. Paul Island that 

 agrees with barrovianus, and another that seems to be inter- 

 mediate. (No. 118716, U. S. National Museum) 



There are a number of records of the smaller barrovianus in 

 the Aleutian district. The records that are not supported by 

 specimens, or specimens that were not examined, are included 

 here on geographic grounds. 



Oberholser (1918) listed specimens from the following places: 

 Unalaska, November 1, 1903; November 12, 1904; July 4, 1901 

 (nestling) ; Amak Island, July 18, 1911 (nestling.) 



Wetmore reported seeing a "finely marked" glaucous gull in 

 Unimak Pass on June 4, 1911. (The specimen that he collected on 

 June 9, at Unalaska, proved to be hyperboreus.) 



Swarth (1934) records two immature specimens taken on 

 Akutan, May 18 and 21, 1927. Laing (1925) obtained two im- 

 mature specimens at Unalaska, March 26 and 28, 1924. 



