vi DEFENCES OF INSECTS 213 



some species at any rate, by the presence of fleshy pro- 

 tuberances (see Fig. 38). The colour of the larvae is 



FIG. 39. Leaf-Butterfly in flight and in repose ; from Wallace. 



usually obscure, in general agreement with that of the 

 bark of a tree ; sometimes the various tints of a stem 



