(See [Frontispiece])
THE BUSH-TIT
All of the forms of Bush-Tits in the United States are non-migratory. The present species, which is better known by the name of the Least Bush-Tit, is confined to the Pacific Coast, where it ranges from northern Lower California to southern British Columbia. This is the range of the typical form (Psaltriparus minimus minimus), while a subspecies called the California Bush-Tit (Psaltriparus minimus californicus) occurs over much of eastern California east of the Sacramento Valley, from the southern end of the Sierras nearly to the Oregon line. A third form, or subspecies, the Grinda Bush-Tit (Psaltriparus minimus grindæ), is confined to the southern end of Lower California.
THE LEAD-COLORED BUSH-TIT
The southern boundary of the range of the Lead-colored Bush-Tit (Psaltriparus plumbeus) is found in western Texas, northern Mexico, southeastern to northwestern Arizona, and the Providence Mountains, California. Thence it occurs north to central and northwestern Colorado, northern Utah and northwestern Nevada. A few individuals have been noted in southwestern Wyoming and southeastern Oregon.
LLOYD’S BUSH-TIT
Scarcely coming across the boundary from its real home in northern Mexico, the Lloyd Bush-Tit (Psaltriparus melanotis lloydi) occurs in the southern part of the mountains of western Texas and barely crosses the line in southwestern New Mexico.
Confined to the borderland of the southwestern United States, the Verdin in its typical form (Auriparus flaviceps flaviceps) is one of the most interesting birds of the desert and semi-arid districts, and is non-migratory. It ranges north to southeastern California, southern Nevada, northwestern Arizona (and extreme southwestern Utah), southwestern and southeastern New Mexico, western and southern Texas, and south into northern Mexico and the northern half of Lower California. The southern half of Lower California is occupied by a subspecies called the Cape Verdin (Auriparus flaviceps lamprocephalus).
THE WREN-TIT