The Migration of North American Sparrows 



THIRTY-SECOND PAPER 



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



With Drawings by Louis Agassiz Fuertes 

 (See Frontispiece) 



PINK-SIDED JUNCO 



The main range of the Rocky Mountains, from southern Canada to northern 

 Mexico, is occupied in summer by four forms of Junco. The Pink-sided is the 

 most northern, breeding from southern Saskatchewan through central Montana 

 to northern Wyoming and southern Idaho. Just to the south of its range comes 

 the Gray-headed Junco, which is the commonest summer bird of the central 

 Rocky Mountain region and is particularly abundant in the mountains of 

 Colorado, where, at eight to nine thousand feet, it nests in dooryards and 

 about porches, like the familiar Chipping Sparrow of the East. It breeds from 

 southern Wyoming to northern New Mexico and west in Utah and Nevada. 

 The principal breeding Junco of New Mexico and Arizona is the Red-backed 

 Junco, which occupies the higher slopes of the mountains of northern Arizona 

 and most of the mountains of New Mexico, except the extreme northern part 

 and a small section in the southwestern part of the state. The Arizona Junco 

 is found principally in northern Mexico, but a few nest in the mountains of 

 southern Arizona and southwestern New Mexico. 



The Pink-sided Junco is the commonest winter Junco of the lower parts of 

 the northern Colorado mountains. It arrived at Boulder, September 3, 1910; 

 Colorado Springs, September 30, 1913; Chusca Mountains, N. M., October i, 

 1908; Willow Creek, Mogollon Mountains, N. M., October 26, 1906, and the 

 Huachuca Mountains, Ariz., October 18, 1907. The last were noted at Ana- 

 conda, Mont., September 30, 1909, aud September 25, 1910. The extreme 

 southern limit is found in the Chisos Mountains, Texas, where the species 

 was taken January 23, 1914. It was taken November 2, 191 o, as far east as 

 Crawford, Neb. 



The first Pink-sided Junco returned to Anaconda, Mont., March 23, 1910, 

 and the last was noted at Silver City, N. M., March 25, 1884; Carlisle, N. M., 

 April 10, 1890; Huachuca Mountains, Ariz., April 15, 1903; Coventry, Colo., 

 April 29, 1908; Colorado Springs, Colo., May 4, 1872, and Golden, Colo., 

 May 15, 1907. 



GRAY-HEADED JUNCO 



This Junco remains in Colorado throughout the year, breeding in the 

 mountains and wintering in the foothills and on the plains. The first was noted 

 at Boulder, September 19, 1909, and October i, 1910. It remains here through 

 the winter, this being the most northern known place in its winter home. The 



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