Bill very thick, convex, with a strong ridge on each side of the lower mandible; claws (when entire) elongated, arched with the sides sloping, edges thin and nearly parallel, the tip rounded; tail short, slightly rounded, of fourteen feathers, independently of the long incumbent coverts. Bill black, claws dusky at the base, yellowish-grey on the edges and tip. In winter, the plumage white, excepting the shafts of the primaries, which are brown, and the tail-feathers, which are black, narrowly tipped with white, and with the base of the same colour. In summer, the male with the head and neck bright chestnut, more or less variegated with dusky; the upper parts and sides having the feathers brownish-black, transversely barred with reddish-yellow, and narrowly tipped with white; the quills and larger coverts, with most of the smaller, middle of breast, abdomen, and feet, white; tail as in winter, the middle incumbent feather like the back. Female similar, with the markings larger, the breast and abdomen coloured like the sides, the head and neck without chestnut. Young, when in down, of a yellowish tint, variegated above with large streaks of dark brown, the top of the head with a longitudinal patch of brown, edged with black. When fledged, the young resemble the female. _Male_, 17, 26-1/2. _Female_, 16, 26. In Maine, New Brunswick, and Nova Scotia, during winter. Breeds plentifully in Newfoundland, Labrador, and the Fur Countries. Rocky Mountains. Tetrao (Lagopus) saliceti, Willow Grouse, Swains. & Rich. F. Bor. Amer. v. ii. p. 351. Willow Grouse or Large Ptarmigan. Nutt. Man. v. i. p. 674. Willow Grouse, Tetrao saliceti, Aud. Orn. Biog. v. ii. p. 528. 302. 2. Lagopus Americanus, Aud. American Ptarmigan. Not figured. Bill much narrower, with the ridge on each side of the lower mandible obsolete; claws (when entire) elongated, arched, with the sides sloping, the edges thin and nearly parallel, the tip round; tail short, even, of fourteen feathers, independently of the long incumbent coverts. In winter, the plumage white, excepting the shafts of the primaries, which are brown, and the tail-feathers, which are black, narrowly tipped with white; male with a black loral band, extending beyond the eye. In summer, the general colour of the upper parts, fore neck, and sides, reddish-yellow, finely undulated transversely with blackish-brown, and greyish-white; the bars on the head and neck larger; the two long incumbent tail-feathers similar to those of the back; the rest brownish-black, tipped with white; little white on the lower parts, and only in patches, some greyish-white undulations occasionally seen, tend to approximate the colouring to that of some specimens of _Lagopus mutus_ of Scotland, but the prevailing tint is not grey, as in that species, but brownish-yellow. Young similar to the adult, with the bands larger; the fore part of the wings, the primaries, secondary coverts, and abdomen, white.