Melanerpes formicivorus. (Swainson.) Picus formicivorus. Swainson in Taylor’s Phil. Mag., 1827, (p. 439,) London. Picus melanopogon. Temminck, Pl. col. Vol. IV., pl. 451. Leyden, about 1829. Melampicos flavigula. Malherbe in Rev. et Mag. de Zool., 1849, p. 542? (Paris.) Form. Compact and rather robust; wing long, with the second and third quills longest, and nearly equal; tail rather broad, and with the feathers but moderately rigid at their ends, unless worn; feet moderately robust; toes long; claws much curved. Rather larger than _Melanerpes erythrocephalus_. (Linn.) Dimensions. (Of a skin from California.) Total length from tip of bill to end of tail, about 9½ inches; wing, 5¾; tail, 3½ inches. Colors. Male. Short feathers immediately around the base of the bill, black. Broad subfrontal band, pure white, which unites with a wide, somewhat crescent-shaped mark of the same color, tinged with pale yellow on the throat and neck in front. Large coronal and occipital space immediately succeeding the white subfrontal band, fine light crimson, of which color there is also a small, irregular spot or two in the centre of a black band on the upper part of the breast. Cheeks, back, wings, and tail fine deep black, with a greenish gloss. Band of black across the breast, succeeded by another, in which the feathers are longitudinally marked with black and white; feathers of the flanks, and under tail coverts, white, with black longitudinal stripes; middle of the abdomen, rump, and spot at the base of the primaries, pure white. The latter most readily observed on the inferior surface of the wing. Secondary quills rather widely bordered with white on their internal edges. Bill nearly black; legs and feet lighter. Female similar to the male, but with a wide band of black on the top of the head. Hab. California and Mexico. Spec. in Mus. Acad. Philada. Observations. The bird described by Temminck as _Picus melanopogon_ is stated by him to have been received from Mexico, and his figure is certainly the bird which is the subject of our present article. His description and figure are in Livraison 76 of the Planches Colorices, which was published about 1828 or 1829, but bears no date, and was anticipated by Swainson’s publication in the Philos. Magazine.