110 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Adult male, winter. — Pure white except for black tail and loreal stripe.^' 



Other plumages. — Unknown. It may however, be assumed that the 

 female also has a white winter plumage, because summer birds have an 

 irregular sprinkling of white feathers on the wings and underparts. In- 

 complete and inconclusive evidence also seems to indicate that the male 

 in autumn is more vermiculated with tawny-olive above than in the sum- 

 mer plumage. This is in keeping with the known tendency of the plumage 

 sequence in this group. Similarly, an undated, unsexed specimen exam- 

 ined appears to be a female in autumn plumage. It differs from the 

 summer female in having the ochraceous marks on the scapulars, back, 

 rump, upper tail coverts, breast, and sides narrower and darker — 

 ochraceous-tawiiy instead of ochraceous-buff. However, at present it 

 cannot be proved that this is an autumn bird rather than an aberrant 

 summer specimen, although it has a scattering of new white feathers in 

 the colored areas suggesting the start of the molt into the winter plumage. 



Adult male.—Wmg 182-193 (187.8); tail 103-113 (108-1); culmen 

 from anterior end of nostrils 9.5-10.8 (9.9) ; width of bill at gape 12-13.1 

 (12.5) ; height of bill at angle of gonys 7.1-8.6 (7.8 mm.).i5 



Adult female.— Wing 166-185 (176.3); tail 96-99 (97.3); culmen 

 from anterior tip of nostril 9.5-9.7 (9.6) ; width of bill at gape 11.6-12 

 (11.7) ; height of bill at angle of gonys 6.7-7.5 (7.1 mm.).^* 



Range. — Known only from Attn Island, the westernmost of the Aleu- 

 tian Islands. 



Type locality. — Attu Island. 



Lagopus albus (not Tetrao albus Gmelin) Dall, Proc. California Acad. Sci., v, 1874, 

 274, part (Attu Island, Aleutian Chain) . 



Lagopus rupestris, var. Turner, Auk, ii, 1885, 157 (Attu Island) . 



Lagopus rupestris atkhensis Turner, Contr. Nat. Hist. Alaska, 1886, 155-156 (Attu 

 Island; plentiful).— Nelson, Rep. Nat. Hist. Coll. Alaska, 1887, 139, part (Attu 

 Island, ex Dall) .— Macoun, Cat. Can. Birds, 1900, 208, part (Attu Island).— 

 Macoun and Macoun, Cat. Can. Birds, ed. 2, 1909, 227, part (Attu Island). 



Lagopus evermanni Elliot, Auk, xiii, 1896, 25, pi. 3 (Attu Island, Aleutian Chain, 

 Alaska; coll. U. S. Nat. Mus.). — ^American Ornithologists' Union, Auk, xiv, 

 1897, 119 (Check-list No. 302.1) ; Check-list, ed. 3, 1910, 142.— Macoun, Cat. 

 Can. Birds, 1900, 208 (Attu Island). — Macoun and Macoun, Cat. Canadian 

 Birds, ed. 2, 1909, 228 (Attu Island) .—Clark, Proc. U. S. Nat. Mus., xxxviii, 

 1910, 55 (Attu Island),— Laing, Victoria Mem. Mus. Bull. 40, 1925, 30 (Attu 

 Island; spec; plum.). 



Llagopusi evermanni Coues, Key North Amer. Birds, ed. 5, 1903, ii, 749 (Attu 

 Island.; descr.). 



[Lagopus] evermanni Sharpe, Hand-list, i, 1899, 19. 



'" This plumage is worn until lale in April, according to Laing, who collected two 

 specimens on April 21, just beginning the prenuptial molt (Victoria Mem. Mus. 

 Bull. 40, 1925, 30). 



" Seven specimens including the type. 



" Three specimens. 



