194 
SEXUAL SELECTIONS' : BIRDS. 
p.MiI 1 
differ from each other chiefly in the points in wh’ c 
they partially resemble their respective males ; and * 
colours of the males may safely be attributed to so*’ 1 * 1 
selection. With many gallinaceous species the 
se. 
differ to an extreme degree, as with the peacock, p' ,e8 
sant, and fowl, whilst with other species there has been 
partial or even complete transference of character fr 0l 'j 
the male to the female. The females of the s6 ve, ‘j 
species of Polvpleetron exhibit in a dim condition, fll> ‘ 
chiefly on the tail, the splendid ocelli of their n)# 1 
The female partridge differs from the male only i» ^ 
red mark on her breast being smaller ; and the fen®* 1 
wild turkey only in her colours being much duller- 
the guinea-fowl the two sexes are undistinguish® 1 
In 
bl 0. 
There is no improbability in the plain, though p 
liar spotted plumage of this latter bird having 
acquired through sexual selection by the males, ^ ^ 
then transmitted to both sexes; for it is not esse j 
tiallv different from the much more beautifully-sp 0 ^ , 
plumage, characteristic of the males alone of the l" 1 
gopan pheasants. ^ 
It should he observed that, in some instances, 
transference of characters from the male to the e 
has been effected apparently at a remote period, 
male having subsequently undergone great c ^ lilll ^ e jv 
without transferring to the female any of his 
gained characters. For instance, the female at |( l 
young ot t ie black-grouse ( Telrao ietrix) rese 1 ' 5 
pretty closely both sexes and the young of the 
grouse i . Scoticus ; and we may consequently 111 
descended fi 
axes were c 
the same manner as the red-grouse. As both seX®* 
fe f 
that the black-grouse is descended from some 
species, of which both sexes were coloured in ve ‘\ 0 { 
this latter species are more plainly barred during 
breeding-season than at any other time, and as the * 
tl>® 
i 
