WARNING COLOEATION. 



175 



delude or dissuade them from eating, or at least trying to- 

 eat, these nudibranchs. It is true that the majority of fishes 

 do use their eyes in hunting, but the list of those that do not 

 comprises a good many forms that must often fall in with 

 nudibranchs, and possibly devour them. 



It cannot, therefore, be admitted that the experiments with 



Fig. 19. — Eolis and Dendronotus. 



nudibranchs offer any support to the theory of warning colours 

 as generally understood ; but they do support the suggestion 

 that unpalatability is associated with brilliant colour, even if 

 that colour is protective. 



Warning Coloration in Wasps. 

 Many stinging Hymenoptera are brightly coloured, and even 

 those that are not are frequently conspicuous. The striking 

 colours of the wasp and the hornet and some of the humble 



