LITERATURE CITED
1886. The code of nomenclature and check list of North American birds adopted by the American Ornithologists' Union. (New York, American Ornithologists' Union), viii + 392 pp.
1910. Check-list of North American birds. Ed. 3, revised (New York, American Ornithologists' Union), 430 pp., 2 maps.
1858. Birds. Pacific Railroad Reports, 9, lvi + 1005 pp.
1901. Description of a supposed new subspecies of Parus from New Mexico. Auk, 18, pp. 165-167.
1843. Descriptions of some new and rare birds of the Rocky Mountains and California. Proc. Acad. Nat. Sci. Phila., 1, pp. 258-262.
1908. The southern California chickadee. Condor, 10, pp. 29-30.
1901. The birds of North and Middle America. U. S. Nation. Mus. Bull., 50, part I, xxx + 715 pp., 20 pls.
1904. Ibid., part III, xx + 801 pp., 19 pls.