Distribution and migration of North American gulls and their allies . e as July 17, 1882 (Comeau). Fall migration.—The average date of arrival in fall at Woods Hole,Mass., is October 8, earliest September 24, 1895 (Edwards); the aver-age at Boston, Mass., October 14, earliest October 7, 1909 (Wright);and the average at Orient, Long Island, October 5, earliest September12, 1906 (Latham). A very early individual was seen near Cam-bridge, Mass., August 29, 1901(Eustis); one near Jones Inlet, Long Is-land, August 14, 1910 (Weber); and at Toronto, Ontario, September NORTH AMERICAN GULLS AND THEIR A


Distribution and migration of North American gulls and their allies . e as July 17, 1882 (Comeau). Fall migration.—The average date of arrival in fall at Woods Hole,Mass., is October 8, earliest September 24, 1895 (Edwards); the aver-age at Boston, Mass., October 14, earliest October 7, 1909 (Wright);and the average at Orient, Long Island, October 5, earliest September12, 1906 (Latham). A very early individual was seen near Cam-bridge, Mass., August 29, 1901(Eustis); one near Jones Inlet, Long Is-land, August 14, 1910 (Weber); and at Toronto, Ontario, September NORTH AMERICAN GULLS AND THEIR ALLIES. 33 18, 1896 (Fleming). The species becomes common in its winterhome about the middle of November. The last one in 1892 at Gothaab, Greenland, was seen on September3 (Stone); North River, Prince Edward Island, November 12, 1889(Bain); and Pictou, Nova Scotia, December 13, 1894 (Hickman). SLATY-BACKED GULL. Larus schistisagus Stejneger. The principal summer home of the slaty-backed gull is on thenorthern shore of the Sea of Okhotsk, the eastern coast of Kam-. Fig. 14.—Slaty-backed gull (Larus schistisagus). 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 itswinter home the middle of October, while a few remain to the last ofthat month. On Bering Island, where it does not breed, it arrivedApril 20, 1883, and remained until May 5 (Stejneger). It winters tosouthern Japan. It has wandered to Herald Island in the Arctic Ocean (Ridgway) ;Diomede Islands in Bering Strait, September, 1880 (Hooper); Port3673°—Bull. 292—15 5 34 BT/LLETTX 292. C. 5. DEPABTZNIEXT OF AGEICULTTTBE. Clarence (Ridgway), where single birds were noted: and to Chernoff-sky Bay, Unalaska. where a large flock was seen October 1. 1SS0(Bean). None of these places is far distant from the usual homeof the species, and it probably occurs not rarely in migration on theshores of Bering Sea and of the adjacent Arctic Ocean. A sp


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