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 

 (U. S. National Museum) ; Cape Lisburne, Alaska, June 10, 1885 

 (U. S. National Museum); Montague Island, Alaska, July 5, 1908 

 (Grinnell) ; and downy young on Plawkins 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 (Loornis) ; 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 xiugust, 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 comiection with the migration 

 route of those individuals that breed in the Mackenzie Valley. 

 Migration dates show that the bird3 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 — hore about 2,500 feet high — in early May, when even tho 

 lowest passes are still deep in snow. 



