The Migration of North American Sparrows 



T-WENTY-THIRD PAPER 



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



With drawings by Louis Agassiz Fuertes 



(See Frontispiece) 



BLACK-THROATED SPARROW 



The individuals occupying the southeastern part of the range of the Black- 

 throated Sparrow from central Texas to Northern Mexico, — typical Amphis- 

 piza bilineata — remain so commonly in winter at the northern limit of the 

 breeding range that no migration dates can be assigned to those individuals that 

 move south in the winter. The birds from farther west in New Mexico, Ari- 

 zona and California — separated as the subspecies A.b. deserticola, or the Desert 

 Sparrow — are true migrants, wintering along the southern boundary of the 

 United States. In their spring migration they have been noted as arriving at 

 Silver, N. M., March ii, 1884; Carlisle, N. M., March 21, 1890; Bedrock, Colo., 

 April 17, 1908; San Felipe Canon, Cal., March 22, 1895; and Furnace Creek, 

 Cal., March 22, 1890. 



BELL'S SPARROW 



The Bell's Sparrow is a non-migratory species, inhabiting the lower parts 

 of southwestern California and northwestern Lower California. 



SAGE SPARROW 



The Sage Sparrow has been separated into three forms: The California 

 Sage Sparrow (Amphispiza nevadensis canescens), comprises the most western 

 individuals occupying a small area in east-central California and western 

 Nevada, where they are non-migratory; the Gray Sage Sparrow (.4. n. cinerea), 

 is limited to the west coast of central Lower California and is non-migratory ; 

 the main bulk of the Sage Sparrows (typical nevadensis) breed from Washing- 

 ton, Idaho and Wyoming to southern Colorado and winter from southern 

 Utah to northern Mexico. The individuals of this form are strictly migratory 

 and are among the early migrating Sparrows, their arrival having been noted 

 at Rupert, Idaho, February 28, 1909; Camp Harney, Oregon, March 11, 1875; 

 and near Boulder, Colo., March 18, 1904. 



LINCOLN'S SPARROW 



Lincoln's Sparrow is divided into two races. The typical form breeds 

 from Nova Scotia to Alaska and south to the mountains of Southern Cali- 

 fornia and New Mexico. It winters from the southern United States to Gua- 

 temala. The race known as Forbush's Sparrow (Melospiza Uncolni striata) is 

 restricted in summer to the coast region of Alaska, and '"migates as far south 

 as southern Lower California. 



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