“Bill black; head dusky; nape spotted with white; back and coverts of the wings and tail of an uniform deep brown; under-side of the neck, breast, belly and thighs deep brown, slightly spotted with white; primaries dusky; inner webs marked with great oval spots of white, mottled with brown; middle feathers of the tail plain brown; inner webs of the rest mottled with white; exterior webs and ends slightly edged with the same; legs strong; wing reaches near the length of the tail. Length, from bill to tail, 2 feet 1 inch. Inhabits Hudson’s Bay.” (Pennant, as above.) We are acquainted with no bird to which this description and measurement apply. 6. Falco spadiceus. Gm., Syst. Nat., I. p. 273. (1788.) The Chocolate-colored Falcon. Penn., Arctic Zool., I. p. 234, pl. 9. “With a short and black bill, and yellow cere. The whole plumage of a deep bay or chocolate color, in parts tinged with ferruginous; primaries black; the lower exterior sides of a pure white, forming a conspicuous spot or speculum; the wings reach to the end of the tail; the exterior sides of the five outermost feathers of the tail dusky; their inner sides blotched with black and white; the two middle black and cinereous; the legs _and toes_ feathered, the last remarkably short. Length, 1 foot 10 inches. Inhabits Hudson’s Bay and Newfoundland. Preys much on ducks. Sits on a rock and watches their rising, when it instantly strikes at them.” (Pennant, as above.) Regarded by authors as a synonyme for the Black Hawk (_Archibuteo sancti-johannis_), but the description suits better the Ferruginous Buzzard (_A. ferrugineus_). Neither of these has, however, the _toes_ feathered, nor otherwise entirely agrees with the description. It may be an unknown species. 7. Falco obscurus. Gm., Syst. Nat., I. p. 281. (1788.) The Dusky Falcon. Penn., Arct. Zool., I. p. 248. “With a bluish bill; upper mandible armed with a sharp process; yellow cere; head, neck and coverts of the wings and tail dusky brown, slightly edged with ferruginous; hind part of the neck spotted with white; primaries dusky; inner webs marked with oval spots of a pale rust color; tail short, tipped with white, and barred with four broad dusky _strokes_, and the same number of narrow ones of white; the hind part of the head spotted with white; from the chin to the tail whitish, streaked downwards with distinct lines of black; legs deep yellow. Inferior in size to the last (_F. dubius_ or _fusca_). Inhabits the province of New York.” (Pennant, as above.)