IV 



SHIFTS FOR A LIVING 



61 



be proved on the one hand and a colour-sense on the 

 other, we may speak of " warning colours." 



The general conclusion seems fairly certain that the 

 conspicuousness of many unpalatable or noxious animals 

 is imprinted on the memory of their enemies, who, after 

 paying some premiums to experience, learn to leave 

 animals with " warning colours ' alone. It will be 

 interesting to discover how far the bright colour, the 

 nauseous taste, the poisonous properties, the distasteful 



FIG. 14. HORNET (Priocnemis) ABOVE, AND MIMETIC BUG 



(Spiniger) BENEATH. 



(From Belt.) 



odour, sometimes found associated, are physiologically 

 related to one another, but to answer these questions 

 we are still unprepared. 



9. Mimicry. The term mimicry is restricted to those 

 cases " in which a group of animals in the same habitat, 

 characterised by a certain type of colour and pattern, 

 are in part specially protected to an eminent degree (the 

 mimicked), and in part entirely without special protection 

 (the mimickers) ; so that the latter live entirely upon the 

 reputation of the former." The fact was " discovered 



