174 
SEXUAL SELECTION: BIRDS. 
pi ® 1 
colouring often characterises allied forms, that in 
species of Ducelo the male differs from the fem 
tl/ 
ale 
(iJ 
; 
in the tail being dull-blue banded with black, 
that of the female is brown with blackish bars; s ° 
here the tail differs in colour in the two sexes in c* 8 /, 
the same manner as the whole upper surface k* 
sexes of Carcineutes. 
, W 
With parrots, which likewise build in holes, 
we 1 
analogous cases: in most of the species both 
brilliantly coloured and undistinguishable, but ifl/.ijj 
few species (he males are coloured rather more W 
than the females, or even very differently from ^ 
Thus, besides other strongly-marked differences; , 
- -■ -osit^ 
¥ 
$ 
whole under surface of the male King Lory (Ap 
scapulatus) is scarlet, whilst the throat and chest A 
female is green tinged with red : in the EupheffM 
dida there is a similar difference, the face and 
coverts moreover of the female being of a ]«d° r , A 
than in the male. 22 In the family of the tits 
which build concealed nests, the female of our c °f 
blue tomtit ( Pants c/eruleus) is “ much less hr ^ < 
coloured” than the male; and in the magnificent ^ ll 
yellow tit of India the difference is greater. 23 jjif 
Again in the great group of the woodpeckers, 
sexes are generally nearly alike, but in the 
2 neus validus all those parts of the head, neck, 
breast, which are crimson in the male are pal® ^ of 
in the female. As in several woodpeckers the h (>1 ^ |: 
the male is bright crimson, whilst that of the fm # 
22 Every gradation of difference between the 
sexes may 
be 
the parrots of Australia. See Gould's 4 Handbook/ &c., vol. ii* P* 1 
33 Macgillivruy’s 4 British Birds,’ vol. ii. p. 433. Jerdon, 
India/ vol. ii. p. 282. 
24 All the following facts are taken from M. Malherbe’s 
‘ Monographic des Piciddes,’ 1861. 
