1853.] : 451 
III. Subfamily BUTEONIN 2. 
1. Genus Bureo, Cuvier. 
1. Buteo borealis, (Gmelin.) Wilson Am. Orn., vi., pl. 52. Aud. B. of Am. 
pl. 51. 
Falco borealis, Gmelin. Syst. Nat., i., p. 266, (1788). 
Hab. Eastern North America, Fur countries, Wisconsin, Florida, Cuba, 
Jamaica. 
2. Buteo Swainsoni, Bonaparte. Comp. List, p. 3, (1838). Rich. and Sw. 
Fauna Boreali Americana, Birds, pl. 27. Aud. B. of Am., pl. 372. 
- <¢ Buteo vulgaris.”? Rich. and Sw. and Aud. 
Hab. Western North America, Oregon, California. 
3. Buteo lineatus, (Gmelin.) Wilson. Am. Orn., pl. 53, fig. 3. Aud. B. 
Git AWG, [Os DB Pike 
Falco lineatus, Gmelin. Syst. Nat., i1., p. 268, (1788). 
Hab. Throughout North America. 
4. Buteo Bairdii, Hoy. (New species.) 
Size smaller than B. dinmeatus, wings long and pointed, with the third primary 
longest, second rather longer than the fifth, first about the same lengthas the 
sixth. Entire plumage of the upper parts dark brownish with a purplish lustre, 
especially obvious on the primaries. 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 dark ashy 
brown, with about ten bands of dark brown and tipped with white. Entire 
under parts and under wing coverts fine pale yellowish white with a few sagit- 
tate spots of brown on the sides, and a distinct stripe of brown running down- 
wards from the corner of the mouth. Front at the base of the upper mandible 
white. Cere, legs and irides yellow. 
Younger ? Entire upper parts very dark brown or nearly black with purplish 
lustre, and entire under parts with almost every feather having a large longitu- 
dinal stripe or spot of the same, this color (brownish black) predominating on 
the breast, and on the throat assuming the form of narrow longitudinal stripes. 
Flanks and under wing coverts with rounded spots of white. ‘Tibize dark brown 
with transverse bars and rounded and oval spots of pale reddish white. Upper 
tail coverts reddish white with their outer edges brown, and with transverse 
stripes of brown. Under tail coverts yellowish white with transverse stripes of 
brown. Stripes from the corners of the mouth wide and conspicuous. Front 
white, cheeks vellowish white. Sex unknown. 
Dimensions.—Female. Total length 194 inches, wing 14, tail §, extent of 
wings 48 inches, tail about an inch longer than the folded wings. 
Hab. State of Wisconsin. 
Obs.—Two specimens of this remarkable Buteo are now in the collection of 
the Academy, for which it is indebted to Mr. William Dudley, Secretary of the 
Wisconsin Natural History Association, and to P. R. Hoy, M. D., of Racine, 
Wisconsin. It bears a general resemblance to the European B. vulgaris, and 
also to B. pennsylvanicus, but is quite different from either and from any other 
species known to me. 
Accompanying Dr. Hoy’s specimen were some interesting notes of the manners 
of this species, with measurements of the recent bird. Itis named by him in 
honor of our mutual and highly esteemed friend Professor Spencer F. Baird, of the 
Smithsonian Institution, one of the most eminent of American naturalists, and 
whose exertions have contributed in a most important manner to the development 
of the natural history of the United States. 
5. Buteo pennsylvanicus, (Wilson.) Wilson. Am. Orn., vi,, pl. 54, fig, 1. 
Aud. B. of Am., pl. 91. 
Falco pennsylvanicus, Wilson. Am. Orn., vi., p- 92, (1812). 
Hab. Eastern North America. 
6. Buteo Harlani, (Aud.) Aud. B. of Am., pl. 86. 
Falco Harlani, Audubon. Orn. Biog., i., p. 441, (1831). 
Hab. Louisiana, Mexico. ‘ 
