This variety is like _mearnsi_ but darker on the head and throat and with less pink on the sides. Its nesting habits and eggs do not differ from those of the Pink-sided Junco. 567g. PINK-SIDED JUNCO. _Junco hyemalis mearnsi._ Range.--Breeds in mountains of Idaho, Wyoming and Montana and winters south to Mexico. This species has the head and breast gray, the back brownish and the sides pinkish brown. They breed at high altitudes in the ranges, placing their nests of grasses under sods or overhanging rocks; their eggs are pinkish white before being blown and are spotted over the whole surface but more heavily at the large end with pale reddish brown and gray. Size .80 × .60. 570. ARIZONA JUNCO. _Junco phæonotus palliatus._ 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. Size .76 × .60. 570a. RED-BACKED JUNCO. _Junco phæonotus dorsalis._ Range.--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 phæonotus 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 × .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. [Illustration 352: White.] [Illustration: 570b--571--572.] [Illustration: White.] [Illustration: left hand margin.] Page 351 571. BAIRD'S JUNCO. _Junco bairdi._ Range.--Southern Lower California. This gray headed species with rusty back and sides is locally confined to the southern parts of the California peninsula where it is resident. Its eggs are not likely to differ from those of the Pink-sided Junco which it most nearly resembles. 567i. TOWNSEND'S JUNCO. _Junco hyemalis townsendi._ Range.--Mountains of northern Lower California; resident and breeding. Similar to the Pink-sided Junco but duller colored; eggs probably the same. 572. GUADALUPE JUNCO. _Junco insularis._ Range.--Guadalupe Island off Lower California