KENNICOTT'S WILLOW-WARBLER 339 



the Yenisei reaching much farther south and extending to the moun- 

 tain regions of northern Mongolia, eastward across Siberia to Bering 

 Sea. Allied races are found in the Kamchatka Peninsula and 

 North Pacific Islands. 



In western Alaska A. b. kennicotti is recorded in coastal regions 

 north to the Kotzebue Sound region (Kowak River), also at Port 

 Clarence, St. Michael and elsewhere on Norton Sound, on Nunivak 

 Island, south to the Aleknagik River, Nushagak, and Iliamna at the 

 base of the Alaska Peninsula, and inland in the Mount McKinley 

 region, Alaska Range. Probably only accidentally (bird found dead) 

 even as far north as Icy Cape, near Wainwright. 



Winter range. — The species winters in the Philippines, French 

 Indo-China, Siam, Tenasserim, Malay Peninsula, and East Indian 

 Islands to the Moluccas; also Formosa, Andaman Islands, etc. 

 Ticehurst (1938, vol. 2) states with reference to kennicotti that he 

 has "seen a few very small birds from various southeastern localities 

 in Asia in winter (Amoy; Tenasserim; Philippines; Penang; Siam) 

 which may represent the winter-quarters, since it does not winter 

 in the New World." 



Spring migration. — Ticehurst gives a number of dates from litera- 

 ture and from labels of skins for the passage through eastern Asia 

 to the breeding grounds, but the data are not extensive enough to 

 give any exact picture of the northward spread of the species. It is 

 apparent that the passage starts in China about the beginning of the 

 second week of May, and the northeastern parts of the country may 

 be reached by the end of the week, but Manchuria and Amurland are 

 apparently not reached till the end of the month. Arrival at Nijni 

 Kolymsk at the mouth of the Kolyma, northeastern Siberia, is re- 

 corded on May 30, and north Norway is reached about the beginning 

 of the third week of June. For Alaska there appears to be no record 

 earlier than June 14. 



Fall migration. — The migration of the species through eastern 

 Asia begins early. It is recorded in northeastern Mongolia by 

 August 7 and in northeast China by August 10, and southern China 

 (Fokien, southeastern Yunnan) may be reached by August 24. The 

 migration continues through October and even into November. 

 Nevertheless, not all birds leave so early as above, for specimens of 

 kennicotti are recorded in Alaska from August 16 to the end of the 

 month and even (Nunivak Island) to September 8. 



Casual records. — The typical race is recorded from Great Britain, 

 Helgoland, Italy, Holland, and near Orenburg, Russia. 



