NORTH AMERICAN GULLS AND THEIR ALLIES. 



33 



18, 1896 (Fleming). The species becomes common in its winter 

 home about the middle of November. 



The last one in 1892 at Gothaab, Greenland, was seen on September 

 3 (Stone); North River, Prince Edward Island, November 12, 1889 

 (Bain); and Pictou, Nova Scotia, December 13, 1894 (Hickman). 



SLATY-BACKED GUL,l\ Larus schistisagus Stejneger. 



The principal summer home of the slaty-backed gull is on the 

 northern shore of the Sea of Okhotsk, the eastern coast of Kam- 



FiG. 14. — Slaty-backed gull (Larus schist isagus). 



chatka, and on the Kuril Islands. Here it arrives about April 20; 

 the height of its nesting season is June 1-10, and it leaves for its 

 winter home the middle of October, while a few remain to the last of 

 that month. On Bering Island, where it does not breed, it arrived 

 April 20, 1883, and remained until May 5 (Stejneger). It winters to 

 southern Japan. 



It has wandered to Herald Island in the Arctic Ocean (Bidgway) ; 

 Diomede Islands in Bering Strait, September, 1880 (Hooper); Port 

 3673°— Bull. 292—15 5 



