BIRDS OF NORTH AND MIDDLE AMERICA 117 



agreeing in its abundance of bars with the corresponding pkimage of 

 L. in. sanfordi. 



Juvenal, unscxcd. — Similar above to the adult male in autumn plumage 

 but paler, more ochraceous-tawny, the blackish bars on the interscapulars, 

 scapulars, and upper back and on the upper wing and upper tail coverts 

 broader, below much paler, the chin and throat light pinkish cinnamon 

 darkening to pinkish cinnamon on the breast and upper abdomen and 

 sides ; the breast, upper abdomen, and sides barred fairly broadly with 

 black ; rest of abdomen pale pinkish buff, flanks, thighs, and under tail 

 coverts light pinkish cinnamon irregularly barred with fuscous. 



Other plumages unkown. 



Adult male.—Wmg 182-189 (186.3) ; tail 100-110 (105.3) ; bill from 

 anterior end of nostril 7.9-9.8 (9); width of bill at gape 11.4-12.2 

 (11.7) ; height of bill at angle of gonys 7.2-8.2 {7.7 mm.).^^ 



Adult female— Wing 171-179 (174.3); tail 85-93 (88.3); bill from 

 anterior end of nostril 9.4; width of bill at gape 9.8-11.4 (10.8) ; height 

 of bill at angle of gonys 6.7-7.2 (7 mm.).-*^ 



Range. — Known only from the type locality, Amchitka Island, Aleutian 

 Islands, Alaska. 



Lagoptis rupestris atkhcnsis Turner, Contr. Nat. Hist. Alaska, 1886, 155-156, part 



(Amchitka, plentiful).— Macoun, Cat. Can. Birds, 1900, 208, part (Amchitka). 



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

 Lagopus mutus gabrielsoni Murie, Condor, xlvi, 1944, 121 (Amchitka Island, Aleu- 



tion Islands; descr. ; crit.). — Clark, Smiths. War Background Stud. No. 21, 



1945, 78 (list birds Aleutians). 



LAGOPUS MUTUS NELSON! Stejneger 



Nelson's Ptarmigan 



Adult mele, summer plumage. — Similar to that of L. m. tozvnsendi 

 but the brownish areas much darker and without any grayish-dark Sac- 

 cardo's umber crossed by fine bars and vermiculations of clove brown 

 to dark fuscous, the central elongated upper tail coverts almost as dark 

 as the rectrices. 



Adult female, summer plumage. — Indistinguishable from that of L. m. 

 evcrmanni. 



Adult male, autumn plumage. — Similar to the summer plumage but 

 very slightly paler, the feathers of the upper parts with narrow whitish 

 tips ; below like the autumn male of L. m. tozvnsendi. 



Adult female, autumn plumage. — Similar to the summer female but 

 with the ochraceous-tawny much more extensive below, extending over 

 the throat, chin, and a large part of the abdomen ; above, the feathers 

 more finely barred and vermiculated, not so broadly barred with blackish. 



*° Three specimens. 



-" Three specimens. 



.653008°— 46 9 



