116 EXPLORATIONS AND SURVEYS WEST OF IOOT1I MERIDIAN. 



Arizona, in October. A well-marked race, differing from the true belli 

 in larger size, as also in the paler coloration. Streaks on the back dis- 

 tinct and always present. These are usually entirely wanting in the 

 typical belli, which is restricted in its range to California. Comparative 

 measurements of the two races are appended. 



Poospiza l)dli. 

 [In Smithsonian collection.] 



Poospiza, var. nevadensis. 



71. Spizella monticola, (Gmel.) Tree-Sparrow. 



Not met with till at El Paso County, Colorado, where, according to Mr. 

 Aiken, it is an abundant winter-resident. Found on the Colorado Chi- 

 quito, New Mexico, by Dr. Kennerly, in December. Specimens taken 

 in this region average considerably lighter than in the east. 



72. Spizella socialis, (Wils.), var. arizonce, Cs. Arizona Chipping-Sparrow. 

 Common through Arizona and New Mexico. Habits and notes appear 



identical with those of the eastern socialis. Two broods are raised in a 

 season. A nest, found July 24, and containing young just hatched, was 

 placed in a small pinon-tree a few feet from, the ground. 



73. Spizella pallida (Sw.), var. breweri, Cass. Brewer's Sparrow. 

 Common, and generally distributed in Eastern Arizona. By the 



