Bonap. Am. Orn. pl. 1, fig. 1, young. Aud. B. of Am. pl. 36, 141, fig. 3; Oct. ed. I. pl. 24, adult and young.
Larger than the preceding; slender; wings short; tail rounded. Adult, head above brownish black, mixed with white on the occiput; other upper parts dark ashy brown, with the shafts of the feathers brownish black; an obscure rufous collar on the neck behind. Throat and under tail-coverts white, the former with lines of dark brown; other under parts transversely barred with light rufous and white; tail, dark cinereous, with four wide bands of brownish black, and tipped with white; quills ashy brown, with darker bands, and white marks on their inner webs. Young. Head and neck behind yellowish white tinged with rufous, and with longitudinal oblong stripes of brown; other upper parts light umber brown, with large partially concealed spots and bars of white; upper tail-coverts tipped with white; under parts white, with narrow longitudinal stripes of light brown; tail as in adult.
Dimensions. Female, total length 18 to 20 inches, wing 10 to 11, tail 8½; male, 16 to 17, wing 9½ to 10, tail 8 inches.
Hab. The entire territory of the United States. Chili, (Gay.)
Spec. in Mus. Acad. Philada.
Obs. Rather a difficult species to the ornithologist, on account of the great variations in its colors, and in size also. It is, in fact, unusual to find two alike in a dozen specimens. Very similar when adult to A. fuscus, but much larger. The adults of both sexes are the same in color. We have latterly suspected that the smaller specimens usually considered as young males of this bird, are really the young of the species next below, (A. Mexicanus.)
This bird is of frequent occurrence in the United States.
3. Accipiter Mexicanus. Swainson. The Mexican Black-capped Hawk. Accipiter Mexicanus. Swains. Faun. Bor. Am. Birds p. 45, (1831,) not figured.
Smaller than the preceding; tail long, rounded. Adult, head above black; other upper parts dark brownish black, with a tinge of cinereous, darkest on the back. Throat and under tail-coverts white; other under parts fine light rufous, deepest on the tibiæ, and barred and spotted with white nearly obsolete on the breast, sides and tibiæ, the longitudinal dark lines on the shafts of the feathers, (conspicuous in A. Cooperii,) barely discernible on the breast. Quills, dark brown, edged exteriorly with ashy, and with bands of darker brown and white on their inner webs; tail, dark cinereous, tipped with white, and with four bands of brownish black, that near the base of the tail obscure. Young, head and neck behind, and upper part of the back, dark rufous, striped with brownish black; other upper parts umber brown; under parts white, with longitudinal narrow stripes of brown; wings and tail as in adult; upper tail-coverts tipped with white. “Iris, carmine,” Dr. Gambel.
Dimensions. Total length, male, 15 inches, wing 9, tail 8 inches.
Hab. California (Dr. Gambel, Mr. Bell); Mexico (Mr. Pease); Eastern? Spec. in Mus. Acad. Philada.
Obs. Similar for the greater part, to A. Cooperii, but smaller, and with the tail and tarsi comparatively longer, and with the fine red of the under parts more uniform, the white stripes being nearly obsolete. Several specimens of both adults and young were brought in the fine collection made in California by Mr. J. G. Bell, of New York, and it was previously brought from the same country by Dr. Gambel, and from Mexico by Mr. Pease.
III. SUB-FAMILY BUTEONINÆ. THE BUZZARDS.
Bill short, strong, upper mandible curved, and with its edges festooned; wings long and broad; tail moderate, rather short; legs and feet moderate; toes rather short. General form heavy; flight vigorous, and capable of being long continued, but not so swift as in preceding sub-families. This group comprises about twenty-five species of all countries.