92 LEONHARD STEJNEGER. 



A fairly recognisable race of the Rock Ptarmigan, characterised by 

 its dark brown color. With the following it shares the peculiarity, that 

 the preästival plumage is scarcely barred but only finely vermiculated with 

 black, thus resembling the postastival plumage of allied forms. Postastival 

 plumage not known. 



5c. Lagopus rupestris atkhensis (Turner) Nelson. 



1874. — Lagopus albus Dall, Avif. Aleut. Isl. from Unal. westw., p. 5, 

 (nee Gmel.) 



1882. Lagopus mutus atkhensis Turner, Pr. U. S. Nat. Mus. 1882. p. 230. 



1883. — Lagopus rupestris occidentalis Nelson, Cruise, Corwin, p. 82. 



(nee Sundev. 1874). 

 1 883. — Lagopus rupestris atkhensis Nelson, Gruise Corwin p. 56 s + ß 82. 



Like the foregoing but much paler. Has a simüarly finely vermicu- 

 lated preästival plumage as L. r. nelsoni, closely resembling the autumn 

 plumage of other Lagopodes. I have, however, examined the speeimens 

 myself andhave foundthem to be in the first plumage following the white 

 one. Only the preästival plumage is known. 



Of very restricted distribution, as it only oecurs in Atkha and pro- 

 bably the other western Aleutian Islands belonging to the United 

 States. 



6. Lagopus leueura Swains. 



1831. — Lagopus leueurus Swains, in Sw. and Richards, Faun. Bor. Amer 

 II. pl. 63. 



This species is easily distinguished from all its congeners by having 

 all the rectrices white at all seasons. Owing to this striking character 

 and its comparatively restricted ränge of distribution it has escaped 

 the fate of being burdened with Synonyms like the other members of 

 the genus Lagopus. 



Habitat. Rocky Monutains and Cascade Mountains, North America. 

 Smithsonian Institution. 



Washington D. G. April 1884. 



