Lagopus rupestris (Gmel.), Syst. Nat. i. p. 751 (1788) ; Audub. B. Am. pl. 301 ; Dresser, vii. p. 175, pls. 480, 481 ; Ogilvie Grant, Cat. B. Br. Mus. xxii. p. 48 ; Bidgway, p. 200 ; Elliot, Monogr. Tetr. pl. 23 ; L. islandorum, Faber, Prodr. Isl. Orn. p. 6 (1822).
Riupa, male Kieri, Icel.
Male ad. (Iceland). Differs in summer plumage from L. mutus in having the head, neck, upper parts, and breast blackish brown barred and vermi¬culated with reddish brown ; supraocular comb light vermilion ; bill brownish horn ; iris dark hazel. Culmen 1.0, wing 7.82, tail 4.95, tarsus 1.2 inch. In the autumn dress it is browner than L. mutus. The female is yellower and more ochreous in tone than the female of L. mutus. In the winter both sexes are white like L. mutus.
Hab. Iceland ; Greenland ; Northern Asia ; Kamchatka ; Boring Island ; Aleutian Islands ; Arctic North America and Newfoundland. In habits and nidification this bird does not differ from L. mutus, and its eggs are undistinguishable from those of that species.
970. Lagopus rupestris