46 TETEAOKID.E. 



Fiiill Ripa, Lhyd, Game B. Steed. Sj- Norm. p. 138, pi. (1867). 

 Tetrao albus, Faton, Scot. Nat. i. p. 112 (1871-2) [Perthshire]. _ 

 Lagopus mutus, var. mutus, Baird, Brew., Sf Ridyiv. B. N. Am. in. 



p. 456(1874). , ., IT- 7 



Lagopus alpinus, var. scandinavica, Sitndev. CEfv. let.-Ak. ±or/i. 



1874, p. 19 [Scaudinavia). ^ -7 v^ti 



Lagopus alpiuus, var. meridionalis, Sudev. CEfv. Vet.-Ak. Fork. 1874, 



p. 19 [Alps and Pyrenees]. 

 Lagopus muta, Stejii. Zeit. ges. Oin. i. p. 87 (1884). 

 Lagopus muta vulgaris, Stejn. Zeit. ges. Orn. i. p. 88 (1884). 



Adult male [winter pluynage']. A black patch extending from 

 the lores through the eye ; the tail-feathers, except the middle pair 

 black, often partly white towards the base and narrowly tipped 

 with white ; rest of the plumage pure white. 



Adult female [winter plumage\ Similar, but with the black patch 

 in front of the eye absent or rudimentary. 



Achdt male [summer ■plumage\ General colour of the head, upper 

 imrts, sides, and flanks dark brown or blackish brown, more or less 

 finely mottled and barred with grey and rusty on the back, rump, 

 and upper tail-coverts ; the chest and upper breast blackish brown, 

 sometimes slightly mottled ; the quills, outer wing-coverts, centre 

 tail-feathers, and rest of uuderparts white. 



Adidt female [summer plumage']. General colour above black, 

 mixed with rufous buff, most of the feathers being edged with 

 ■white or pale buff ; underparts rufous buff, barred with black ; 

 centre tail-feathers barred with black and buff; rest of the tail- 

 feathers black tipped with white, as in the male, and often with a 

 large portion of the basal part white ; quills and outer wiug-coverts 

 white. 



Adult male [autumn plumage']. General colour of the upper 

 parts, central pair of tail-feathers, chest, upper breast, and sides 

 grey, finely mottled with black, and sometimes with buff; quills, 

 outer wing-coverts, and the rest of underparts white. 



Adult female [autumn plumage']. Similar to the male, but usually 

 to be distinguished by retaining a few of the reddish-buff and black 

 feathers of the faded summer plumage. 



Adult male. Total length 14-5 inches, wing 7-6, tail 4-6, tarsus 

 1-3. 



Adidt female. Total length 14 inches, wing 7-4, tail 4-1, 

 tarsus 1-3. 



Immature birds differ only from the adult in having the prim- 

 aries mixed with blackish brown along the shaft. 



Young birds have the general colour of the head, upper parts, 

 chest, and sides black, barred and mottled with rufous buff, most 

 of the feathers with a white spot at the extremity ; the primaries 

 are brownish black, mottled with buff on the outer web ; the belly 

 and rest of underparts are whitish, indistinctly barred with dusky ; 

 tail-feathers black, with irregular bars and markings of buff. 



The above plumages are, we consider, fairly typical of the seasons 

 in which they occur, but the individual variation is so great 



