PL XII. 



(P.Z.S. 1910. PL -vr.) 



Andre Si Sleigh. Ltd 



FEMALE GROUSE, RED TYPE ; FEATHERS FROM FLANKS. 



Female sniuse, led type, feathers from Ranks. Natural size. 



Fig. a and t (from No. 1864*. fi and h (from No. 226). and k (from No. 632). are 

 varieties of the spring Hank-feathers. 



Fig. b (from No. 575) is a Hank-feather from a very black hen. 



Fig. d from No. 1864) is an example of what is termed fine-barred, dark-red 

 winter-plumage, with narrow black bars or lines on rather dark rufous 

 chestnut, the latter being slightly bleached towards the tip. 



Figs, <■ and/ (from No. 1864 > and / and m (from No. 664 > illustrate interme- 

 diate stages of colouration, the feathers probably having broken through 

 the skin w-hen winter-conditions prevailed, and having completed .their 

 growth under summer-conditions. 



Figs, i and n (from No. 664) illustrate the reasoning upon which is based the 

 view just mentioned : of these two feathers there is no doubt that n was 

 being grown much later than (. and therefore more in summer-condi- 

 tions, producing summer breeding-plumage. 



