124 THE ENEMIES OF BUTTERFLIES [ch. ix 



e.g. Papilio polytes, rest with wings outspread, and 

 there are rare cases, such as that of P. laglaizei 

 (p. 27), where the most striking point about the re- 

 semblance is only to be appreciated when the insects 

 are at rest with their wings closed. In such cases it is 

 conceivable that the monkey may play a part in the 

 elimination of the non-mimetic elements of a palatable 

 species which at the same time possessed a mimetic 

 form closely resembling another species disagreeable to 

 the monkey's taste. As has been pointed out earlier 

 (p. 96) even a slight persecution directed with adequate 

 discrimination will in time bring about a marked result 

 where the mimetic likeness is already in existence. It 

 is not impossible therefore that the estabUshing of such 

 a likeness may often be due more to the discrimination 

 of the monkey than to the mobility of the bird. 



