Range. - Mountains of western Mexico north to southern Arizona.

Similar to the preceding species but upper mandible blackish and the gray on throat shading insensibly into the grayish white underparts. They are quite abundant in the higher ranges of southern Arizona, where they breed, placing their nests on the ground in similar locations to those chosen by other Juncos; the three or four eggs are greenish white, finely speckled chiefly about the large end with reddish brown. Sixe .76 x .60.

570a. Red-Backed Junco. Junco Phaeonotus Dorsalis

Rang. - Breeds in the mountains of New Mexico and Arizona and southward. This variety is like the last but the reddish brown on the back does not extend to the coverts or wings. The nesting habits are like those of the last but the eggs are only minutely specked about the large end.

570b. Gray-Headed Junco. Junco Phaeonotus Caniceps

Range. - Rocky Mountain region from Wyoming south to Mexico.

This species is similar to the Slate-colored Junco but has a reddish brown patch on the back. They nest on the ground in mountainous regions, concealing the nests in tufts of grass or under logs, stones, etc. The eggs are creamy or bluish white, specked over the whole surface, but most numerously about the larger end with reddish brown. Size .75 x .60. Data. - Custer Co., Colo., June 4, 1897. Slight nest of small rootlets and fine grass placed under a tuft of grass. Altitude over 8,000 feet.

White.

White.