SEXUAL COLOUR 81 
the most brilliant colour compared to their 
females. 
3. If females select then, there must be 
either more males than females or polygamy : 
but in many insects which present marked 
sexual differences, males and females are 
equalin number. Further, very few examples 
of selection by females have been recorded ; 
whereas many experiments have been carried 
out that conclusively show that females do 
not select. 
4. In many animals, the male undoubtedly 
selects the female, and yet the male is the 
more brightly coloured. 
5. The displays of courtship are not to do 
with mating, but, as has been shown, are 
pre-copulatory displays; they therefore do 
not play the réle in sexual selection which 
is assigned to them. 
6. Further, these displays are not made 
only by animals which present secondary 
sexual differences in characters, but are also 
made by animals whose sexes are similar. 
7. Sexual selection does not explain the 
absence of conspicuous male colouring in 
predatory and night animals; or rather they 
form unexplained exceptions. 
Of course there must be many facts which 
F 
