The Migration of North American Sparrows 



THIRTEENTH PAPER 



Compiled by Professor W. W. Cooke, Chiefly from Data in the Biological Survey 



With Drawings by Louis Agassiz Fuertes 

 (See frontispiece) 



EVENING GROSBEAK 



The Evening Grosbeak has been separated into two forms. The western, 

 Montana, breeds in the mountains from southern British Columbia and 

 northwestern Montana south to southern Arizona. During the interim between 

 the breeding seasons, these birds wander over much of the district from the 

 eastern foothills of the Rockies to the Pacific Ocean, but their movements are 

 so irregular that no average dates can be calculated. On the plains near 

 Denver, Colorado, they remained, in the spring of 1909, until May 24. After 

 breeding in the mountains, the earliest returned to the plains August 8. 



The other form of the Evening Grosbeak, vespertina, breeds in the Rocky 

 Mountains north of the United States, and is strongly migratory. But instead 

 of moving in approximately north and south lines, as is the case with most 

 birds, these Evening Grosbeaks migrate east and southeast in the fall, and 

 return west and northwest in the spring. The following table will give an idea 

 of the usual time of migration in the district in which the birds occur nearly 

 every winter. 



FALL MIGRATION 



PLACE 



Manitoba. 

 Minnesota 



Iowa 



Wisconsin. 

 Michigan. 

 Ontario . . . 



Number 



of years' 



record 



Average date of 



Earliest date of 



fall arrival 



fall arrival 



S 



October 31 



October 26, 1901 



II 



October 21 



October 11, 1880 



s 



November 18 



November 2, 1898 



9 



November 11 



October 10, 1903 



4 



November 22 



October 21, 1909 



5 



December 18 



December 5, 1906 



SPRING MIGRATION 



PLACE 



Manitoba. 

 Minnesota 



Iowa 



Wisconsin. 

 Michigan. 

 Ontario . . . 



Number 



of years' 



record 



13 

 4 



7 

 4 



Average date of 

 the last one seen 



May 14 

 May 2 

 May 14 

 May 9 

 March 23 



Latest date of the 

 last one seen 



June 3, 1907 

 May 22, 1890 

 May 7, 1890 

 May 20, 1891 

 May 17, 1890 

 May 26, 1890 



How irregular are the movements of the Evening Grosbeak can be judged 

 from its record at Chicago, 111. Dates of arrival: December 20, 1883; Decem- 



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