564. Spizella wortheni. 5 inches.
This is a southern form of the [Chipping Sparrow], and is found in New Mexico and Mexico.
BLACK-CHINNED SPARROW.
565. Spizella atrogularis. 5½ inches.
This is easily identified by the black chin, throat and forehead. It is quite common in parts of southern California, and south into Arizona and New Mexico. The habits are similar to those of the Field Sparrow, their eggs differing in being unspotted and are a bluish green (.65 × .50).
WHITE-WINGED JUNCO.
566. Junco aikeni. 6½ inches.
This is slightly larger than the common “Black and White Snowbird” (Hyemalis). It is also a paler bird and the wings are crossed by two white bars. It is found in the central Rocky Mountain regions, where it breeds in the northern part, and winters to eastern Colorado.