116 BULLETIN 50. UNITED STATES NATIONAL MUSEUM 



Adult female.— Wing 175-188 (181.6) ; tail 91-101 (96.6) ; bill from 

 anterior end of nostril to tip 9.7-10.7 (10.2) ; width of bill at gape 11.1- 

 12.3 (11.6) ; height of bill at angle of gonys 7.3-8.2 (7.8 mm.).^^ 



Range. — Resident in Atka Island, Aleutian Islands, Alaska. 



Type locality. — Atka Island. 



Lagopus mutns atkhcnsis Turner, Proc. U. S. Nat. Mus., v, 1882, 230, 231 (Atka 

 Island, Aleutian Chain, Alaska; coll. U. S. Nat. Mus.). — Ridgway, Bull. Nuttall 

 Orn. Club, vii, 1882, 258. — Reichenovv and Schalow, Journ. fiir Orn., 1883, 409 

 (reprint of orig. descr.). — Hartert, Vog. pal. Fauna, iii, 1921, 1871. — Ober- 

 HOLSER, Auk, xxxix, 1922, 247.— Peters, Check-list Birds of World, ii, 1934, 34 

 (Atka Island). — Salomonsen, Moults and Sequence of Plumage in Rock 

 Ptarmigan, 1939, 10 (spec). — Hellmayr and Conover, Cat. Birds Amer., i, 

 No. 1, 1942, 207 (syn.; distr.).— Clark, Smiths. War Background Stud. No. 21, 

 1945, 78 (list birds Aleutians). 



[LagoptirS] mlutus] atkhensis Salomonsen, Medd. Grj^nland, cxviii. No. 2, 1936, 

 31 in text (Atka Island). 



Lagopus rupestris atkhensis Stejneger, Zeitschr. Ges. Orn., i, 1884, 92.— American 

 Ornithologists' Union, Check-list, No. 302c, 1886; ed. 2, 1895, No. 302c; ed. 3, 

 1910, 141 ; ed. 4, 1931, 83.— Turner, Contr. Nat. Hist. Alaska, 1886, 155, pis. 

 3, 4.— Nelson, Rep. Nat. Hist. Coll. Alaska, 1887, 139.— Bendire, Life Hist. 

 North Amer. Birds, i, 1892, 81.— Macoun, Cat. Can. Birds, 1900, 208, part (Atka 

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

 Island). — Clark, Proc. U. S. Nat. Mus., xxxviii, 1910, 55 (habits). — Laing, 

 Victoria Mem. Mus. Bull. 40, 1925, 28 (Atka Island; spec; habits; plum.).— 

 Bent, U. S. Nat. Mus. Bull. 162, 1932, 218 (Atka Island; habits).— Eyerdam, 

 Murrelet, xvii, 1936, 50 (Atka Island; abundant). 



L[agopns] rupestris atkhensis Ridgway, Man. North Amer. Birds, 1887, 201. 



L[agopus] rlupestris} atkhensis Coues, Key North Amer. Birds, ed. 5, ii, 1903, 

 747 (Atka Island). 



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



Lagopus rupestris occidentalis (not Lagopus rupestris, van occidentalis Sundevall) 

 Nelson, Cruise of Corzvin in 1881 (1883), 82 (Atka Island, Aleutian Chain, 

 Alaska; coll. U. S. Nat. Mus.). 



Lagopus rupestris (not Tetrao rupestris Gmelin) Ogilvie-Grant, Cat. Birds Brit. 

 Mus., xxii, 1893, 527, part. 



LAGOPUS MUTUS GABRIELSONI Murie 



Amchitka Ptarmigan 



Adult male, sumuicr plumage. — Like that of L. in. toivnscndi but the 

 upperparts with the blackish barring heavier and darker, and the brown- 

 ish ground color slightly less tawny. 



Adidt female, summer plumage. — Like that of L. m. nclsoni. 



Adult male, autumn plumage. — Similar to that of L. in. townsendi but 

 darker, the general tone of the brownish parts being dark buckthorn 

 brown with an ochraceous tinge, and with many more .blackish bars^ 



'* Fourteen specimens. 



