The Migration of Thrushes 



FOURTH PAPER 



Compiled by Professor W. W. Cooke, Chiefly from Data 



in the Biological Survey 



With drawings by Louis AGASSiz Fuertes and Bruce Horsfall 



VARIED THRUSH 



THE Varied Thrush, under which name both forms of this species are 

 included, breeds from northwestern California, northern Idaho and 

 northwestern Montana, north to Fort Franklin, Mackenzie, Fort 

 Yukon, and the Kowak river, Alaska; winters from central Washington 

 to southern California. Accidental in New Jersey, Long Island, Massachu- 

 setts, Kansas and Guadalupe Island, Lower California. 



The spring migration begins so early that, on the average, 

 migrants arrive in central Washington March 6 and southern British 

 Columbia March lo. The valley of the Kowak river, Alaska, was reached 

 May 21, 1899. The average date of arrival at Columbia Falls, Mont., is 

 April I, and the earliest date is March 2, 1895. Central California is 

 deserted, on the average, April 2, and the latest date in southern California 

 is April 12, 1899. 



The species leaves its breeding grounds in northern Alaska about the 

 first of September and usually arrives in central California, along the coast, 

 November 7, the earliest date being September 27, 1898. It appears on the 

 higher mountains of northern California about the first week in October. 



SAINT LUCAS ROBIN 



The Saint Lucas Robin is a resident species in the southern portion of 

 Lower California. The only record for the United States is that of a speci- 

 men taken January 2, 1880, at Haywards, California. 



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