Colors. Female (Plate XLI., upper figure), entire upper parts dark brown, with a purplish bronzed lustre, especially on the wings; plumage of the head and neck behind, and some feathers on the back edged and tipped with yellowish white; upper tail-coverts yellowish white, with transverse bars of brown; tail above brownish cinereous, and having about ten narrow bands of brownish black, and tipped with white; under parts pale yellowish white or fawn color, with a few sagittate spots of brown on the sides, and a stripe of dark brown running downwards on each side from the corners of the mouth; cere, legs, and irides yellow. Younger? (Plate XLI., lower figure.) Upper parts very dark brown or nearly black, with a purplish lustre; under parts with almost every feather having a large spot of brownish black, which color predominates on the breast, presenting a nearly uniform color with the upper parts; throat with narrow stripes of the same color; flanks and inferior wing-coverts with circular and oval spots of white; tibiæ dark brown, with transverse bars and circular and oval spots of reddish white; upper tail-coverts reddish white, with their outer edges brown, and with transverse stripes of the same; under tail-coverts yellowish white, with transverse stripes of brown; forehead white; cheeks yellowish white; stripes from the corners of the mouth wide and conspicuous. Sex unknown. Hab. Wisconsin (Dr. Hoy, Rev. Mr. Barry, Mr. Dudley); Utah Territory (Lieut. Beckwith). Spec. in Nat. Mus., Washington, and Mus. Acad., Philadelphia. Obs. This bird does not intimately resemble any other of the American Falconidæ at present known, and is a well marked species, especially in the plumage above described as probably the younger. In this the nearly uniform brownish black breast and large spots of the same color on the other under parts are strongly characteristic. The plumage of the first described above bears some resemblance to the young of _Buteo lineatus_, and also to the young of _Buteo pennsylvanicus_, but not sufficient to require especial consideration. To us it is a point of high interest that the present bird bears the name of one with whom our relations have been intimate and of the most pleasant character almost since boyhood. One who is a most competent and efficient officer of the first Institution in America for the diffusion of knowledge—one who has gained a rank amongst the first American zoologists; and better, no man lives who is more conscientious in the discharge of his duties, more respectful of all that renders life agreeable, or more faithful in his friendships, than Spencer F. Baird, of the Smithsonian Institution. TOXOSTOMA REDIVIVA.—(Gambel.) The Curved-billed Thrush. PLATE XLII. Adult Male.