120 BULLETIN 50, UNITED STATES NATIONAL MUSEUM 



Lagopus rupestris kelloggae Grinnell, Univ. California Publ. Zool., v, 1910, 383 

 (Kaikoff Bay, Montague Island, Prince William Sound, Alaska, 1,600 feet 

 altitude; coll. Univ. California Mus. Vert. Zool.).— Oberholsek, Auk, xxxiv, 

 1917, 200.— American Ornithologists' Union, Check-list, ed. 4, 1931, 84 

 (distr.).— Bent, U. S. Nat. Mus. Bull. 162, 1932, 227 (habits, etc.).— Bahey, 

 Brower, and Bishop, Progr. Activ. Chicago Acad. Sci., iv, 1933, 24 (Point 

 Barrow, Alaska) .—Swarth, Pacific Coast Avif., No. 22, 1934, 26 (Nunivak 

 Island, Alaska ; spec). — Taverner, Birds Canada, 1934, 159 in text. — Friedmann, 

 Journ. Washington Acad. Sci., xxiv, 1934, 235 (Kodiak Island; bones); Bull. 

 Chicago Acad. Sci., v, 1935, No. 3, 31 (Kodiak Island) ; Journ. Washington 

 Acad. Sci., xxvii, 1937, 433 (Kodiak Island; bones).— Bray, Auk, Ix, 1943, 516 

 (Southampton Island; Baflfin Island; Melville Peninsula). — Dixon, Condor, 

 xlv, 1943, 55 (Arctic Alaska; Camden Bay; Demarcation Point). 



Llagopiul r[upestris'\ kelloggae Taverner, Canada's Eastern Arctic, 1934, 119, in 

 text (Arctic islands and coast regions of nw. mainland of Canada). 



Lagopus mutus kelloggae Oberholser, Auk, xxxix, 1922, 247. — Peters, Check-list 

 Birds of World, ii, 1934, 34 (nw. North America from Alaska east along 

 Arctic coast and adjoining islands to ca. 100° W., south to Alaskan Peninsula, 

 and s. Alaska to ca. 60° N.). — Salomonsen, Medd. Grj^nland, cxviii. No. 2, 

 1936, 34 (syn. ; diag. ; distr.). — Steinbacher, Erganzungsband to Hartert's Vog. 

 pal. Fauna, 1938, 515, part (Alaska and North Amer. at least to Bathurst Inlet). 

 — Salomonsen, Moults and Sequence of Plumage in Rock Ptarmigan, 1939, 

 10 (spec). 



Llagopus] m[utus\ kelloggae Salomonsen, Medd. Gr^nland, cxviii, 1936, 4 in text, 

 22 in text (Alaska and Northwest Territory east to Coronation Gulf and to 

 Bathurst Inlet). 



Lagopus mutus rupestris (not of Gmelin) Grote, Falco, Sonderheft, 192S, 201 

 (Jenissei region, Siberia).- — Bailey, Condor, xxviii, 1926, 122 (nw. Alaska; 

 distr.; habits. — Sserebrowsky, Journ. fiir Orn., 1926, 694 in text (spec; 

 Alaska) . 



Lagopus mutus americanus Hellmayr and Conover^ Cat. Birds Amer., i, No. 1, 

 1942, 205, part (syn.; distr.). 



LAGOPUS MUTUS DIXONI J. Grinnell 



Dixon's Ptarmigan 



Adult male, summer plumage. — Like that of L. m. nelsoni but with the 

 brownish markings less ochraceous-tawny, duller and much reduced in 

 size and number, making the bird much darker, approaching in this char- 

 acter L. m. evermanni, but with more tawny to hazel vermiculations on 

 the breast and back. Above, general color of all but the white areas, 

 sooty bister ; whole crown and occiput sooty, minutely and rather sparsely 

 barred with tawny-oHve to hazel; breast barred with tawny, the bars 

 becoming narrower posteriorly and practically disappearing on the lower 

 breast. 



Adult female, summer plurnage. — Like the corresponding plumage of 

 L. m. evermanni. 



Adidt male, autumn plumage. — Like the male in summer plumage but 

 paler, more grayish above — dark hair brown with a grayish "bloom," the 

 blackish areas greatly reduced. 



