48 BULLETIN 292, U. S. DEPARTMENT OF AGRICULTURE. 
Spring migration. — One of these gulls was noted in Queen Charlotte 
Sound, British Columbia, April 6, 1909 (Swarth) ; Windfall Harbor, 
Admiralty Island, Alaska, April 24, 1907 (Grinnell) ; St. Michael, 
Alaska, May 11, 1866 (specimen in U. S. National Museum); Mount 
McKinley, Alaska, near base, May 10, 1908 (Sheldon) ; Fort Simpson, 
Mackenzie, May 8, 1904 (Preble); and the lower Kowak River, 
Alaska, May 15, 1899 (Grinnell). 
Eggs were taken on the Lockhart River, Mackenzie, as early as 
May 28, 1862 (MacFarlane) ; Fort Resolution, Mackenzie, June 7, 
1860 (Kennicott) ; Fort Rae, Mackenzie, June 6, 1862 (specimen in 
U. S. National Museum) ; mouth of Porcupine River, Yukon, June 9, 
1865 (U. S. National Museum) ; St. Michael, Alaska, June 6, 1878 
(IT. S. National Museum) ; Cape Lisburne, Alaska, June 10, 1885 
(U. S. National Museum) ; Montague Island, Alaska, July 5, 1908 
(Grinnell) ; and downy young on Hawkins Island, Alaska, June 23, 
1908 (Grinnell), and at Lake Marsh, Yukon, July 1, 1899 (Bishop). 
The species was common all the summer of 1907 at various localities 
in the Sitka district, but apparently none were breeding (Grinnell). 
Fall migration. — A specimen taken July 30, 1856, in Puget Sound 
(U. S. National Museum) probably represents an early fall migration 
of a nonbreeding bird, as also those seen July 18, 1909, at Bradfield 
Canal, British Columbia (Swarth). The first was noted at Chilli- 
wack, British Columbia, August 26, 1889 (Brooks); Scio, Oreg., 
September 21, 1900 (Prill); Berkeley, Cal., October 9, 1886 (Keeler) ; 
Monterey, Cal., October 29, 1896 (Loomis) ; Ventura, Cal., Novem- 
ber 26, 1884 (Henshaw); and San Diego, Cal, December 11, 1884 
(Henshaw) . 
The species departed from the lower Kowak River, Alaska, the last 
week in August, 1898 (Grinnell) ; the last were at Cape Nome, 
Alaska, August 28, 1910 (Thayer) ; Icy Cape, Alaska, July 30 (Seale) ; 
Collinson Point, near Camden Bay, Alaska, September 8, 1914 (An- 
derson); St. Michael, Alaska, September 23, 1899 (Bishop); near 
Lake Hardisty, Mackenzie, August 25, 1903 (Preble) ; and Peters- 
burg, near Sitka, Alaska, October 7, 1913 (Willett). 
An interesting question arises in connection with the migration 
route of those individuals that breed in the Mackenzie Valley. 
Migration dates show that the birds do not enter Mackenzie by way 
of the Yukon Valley, for the arrival dates are as early at Fort Simpson, 
Mackenzie, as at the mouth of the Yukon. Future investigations 
will undoubtedly show that these Mackenzie Valley birds make a 
direct flight from the coast of southern Alaska to Great Slave Lake, 
though this requires that they cross the divide of the Rocky Moun- 
tains — here about 2,500 feet high — in early May, when even the 
lowest passes are still deep in snow. 
