VARIABILITY. 
129 
Ar> 
XIV. 
Of 
the 
are 
bla c v- Senus Xenorhynchus those of the male a 
t- s 'Wei, whilst those of the females are gam- 
^e-yello 
om ir > with many hornhills (lluceros), as I hear 
(L. ^ B]v+R 42 
hi!/wi es 
'W; 
Ulvtli, 4 - the males have intense crimson, and 
white eyes. In the Buceros bicornis, the 
Afg a * are black in the male, but not so in the female. 
e be.^ 5 111 ^ ie (Jasc l ue an( t a stripe on the crest of 
'bin 
ti 6; 
*e to 
Sou 
!1J ted 
V 0|'V 
suppose that these black marks and the 
c °lour of the eyes have been preserved or aug- 
H , through sexual selection in the males? This 
^0 q 1 o ,‘. c ° u btful ; for Mr. Bartlett shewed me in the 
^Uce r &lCa ^ hardens that the inside of the mouth of this 
^hal e . JS 'back in the male and flesh-coloured in the 
tot b e ’! ln< * their external appearance or beauty would 
*bfj ; IUs affected. I observed in Chili 43 that the 
^the 
< 4 ,„ 
K 
kt 
condor, when about a year old, is dark-brown, 
ail &es maturity into yellowisli-brown in the 
The male 
]l *ts a ] atlc ' »>to bright red in the female. 
''%t ( a snia ll, longitudinal, leaden-coloured, fleshy 
"Wb is . c ,° m b. With many gallinaceous birds the 
''tritg ^| u Sbly ornameutal, and assumes vivid colours 
'b thg 1 ® au t of courtship ; but what are we to think 
1|() t 1:1 ^-coloured comb of the condor, which does 
K 
appear 
:s tio 
t° us in the least ornamental? The same 
lna y be asked in regard to various other 
l* e Objp SUc ' J as the knob on the base of the beak of 
Wr j Q eSe S°Qse (. Anser cygnnides), which is much 
a We r c the male than in the female. No certain 
If ^ ^' ven to these questions; but we ought 
® 8 hy a 1Q us in assuming that knobs and various 
" lc ‘ti ^ bondages cannot be attractive to the female, 
le member that with savage races of man 
