EGGS OF NORTH AMERICAN BIRDS. 109 



and Northern New England, north to the fur countries and 

 Labrador, m June, 



559. Tree Sparrow, SjnzeUa monticola. Eggs, 4 or 5, 

 oval, greenish ash, spotted with reddish brown ; .55 -j- .70 to 

 ,56 -|- .74, somewhat resembling those of the Field Sparrow, but 

 larger. Nests placed in bushes, composed of mud, grass, and 

 weeds, Imed with hair. Breeds in North America, north of 

 the United States, east of the Rocky Mountains, in June. 



559a. Western- Tree Sparrow, Spizella monticola ochra- 

 cea. Eggs, probably indistinguishable from those of No. 559. 

 Breeds in Alaska. 



560. Chipping Sparrow, Spizella socialis. (Type, Plate 

 VIII.) Eggs, 4 or 5, oval, blue, spotted, dotted, and lined 

 with black and lilac ; .60 -|- .75 to .55 -\- .80. Nests placed in 

 trees and bushes, composed of fine roots, lined with horse- 

 hair. Breeds in Eastern North America, west to the Rocky 

 Mountains, from the middle districts northward to Great Slave 

 Lake and the British Provinces, in June. 



560a. Western Chipping Sparrow, Spizella socialis ari- 

 zoncB. Eggs, indistinguishable from those of No. 560, and the 

 nests and nesting habits are similar. Breeds in Western 

 United States, from the Rocky Mountains to the Pacific, in 

 May. 



661. Clay-colored Sparrow, Spizella p)CLllida. Eggs, 4 or 

 5, oval, greenish blue, spotted, dotted, and lined with brown, 

 seldom with black; .50 -j- .72 to .55 + .80. The almost 

 universal absence of black lines distinguishes them from those 

 of No. 560. Nests placed in bushes, composed of grass and 

 weeds, lined with rootlets and hair. Breeds in the interior 

 of North America, from Illinois and Iowa west to the Rocky 

 Mountains, north to the Saskatchewan plains, in May. 



562. Brewer's Sparrow, Spizella breioeri. Eggs, indis- 

 tinguishable from those of No. 561, and the nests and nesting 

 habits are similar. Breeds in Western United States, from 

 the eastern base of the Rocky Mountains to the Pacific coast, 

 in May and June. 



