BIRDS OF NORTH AND MIDDLE AMERICA 121 



Adidt female, autumn plumage. — Like the autumn male with the black 

 bars and vermiculations more pronounced and without the grayish 

 "bloom." 



Female, first autumn plumage. — Like the adult female in autumn, but 

 outer primaries more pointed and the pale bars decidedly more ochraceous- 

 tawny and broader, above and on the breast.^* 



Juvenal (unsexed). — Like the females in first autumn plumage but 

 with the remiges dull hair brown externally mottled with bufify; entire 

 underparts barred like the breast, the dark bars somewhat paler on the 

 abdomen. 



Downy young. — Apparently unknown. 



Adult male.— Wing 172-195 (181.7) ; tail 101-120 (107.8) ; bill from 

 anterior end of nostril to tip 9-10.2 (9.6) ; width of bill at gape 11.2-12 

 (11.6) ; height of bill at angle of gonys 6.8-7.4 (7.2 mm.).^" 



Adult female.— Wing 163-179 (172); tail 91-107 (97.7); bill from 

 anterior end of nostril to tip 8.8-9.8 (9.3) ; width of bill at gape 10.7-11.8 

 (11.2) ; height of bill at angle of gonys 6.3-7.2 (6.9 mm.).='i 



Range. — Resident in the islands and coastal mainland of the Glacier 

 Bay region of Alaska, south to Baranof Island, and inland for an un- 

 determined distance, intergrading with L. w. rupestris in central northern 

 British Columbia (Ingenika, Chapa-atan, and Sheslay Rivers). 



In winter the birds wander southward from the northern parts of the 

 range but do not seem to go south beyond the limits of the breeding 

 range. It is possible that in winter some of the birds in the northern 

 mainland part of the range of this race actually belong to the forms 

 nelsoni or rupestris, but there is no way to tell them apart in winter 

 plumage, other than size (which is only an average character). 



Type locality. — Near Port Frederick, 2,700 feet, Chichagof Island, 

 Alaska. 



Lagopus dixoni Geinnell (J.), Univ. California Publ. Zool., v, 1909, 207 (moun- 

 tains near Port Frederick, Chichagof Island, s. Alaska, 2,700 feet alt. ; coll. 

 Univ. California Mus. Vert. Zool.). 



Lagopus rupestris dixoni American Ornithologists' Union, Auk, xxvi, No. 3, 

 1909, 296 (Check-list No. 302f) ; Check-list, ed. 3, 1910, 142; ed. 4, 1931, 84.— 

 SvvARTH, Univ. California Publ. Zool., vii, 1911, 59 (Port Snettisham, s. Alaska; 

 crit.). — Brooks, Bull. Mus. Comp. Zool., lix, 1915, 365 (Muir Inlet, Glacier 

 Bay, Alaska). — Bailey, Auk, xliv, 1927, 200 (near Juneau, se. Alaska; habits). — 

 Bent, U. S. Nat. Mus. Bull. 162, 1932, 223 (habits, etc.). 



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

 of World, ii, 1934, 34 (islands and adjacent mainland of the Glacier Bay region, 

 Alaska, s. to Baranof Island). — Salomonsen, Moults and Sequence of Plumage 

 in the Rock Ptarmigan, 1939, 10 (spec). 



^ No first autumn males seen. 



" Nine specimens from Juneau and near Sitka, Alaska. 



'^ Six specimens from Juneau, Sitka, and Kruzof Island, Alaska. 



