VI 



DEFENCES OF INSECTS 



207 



nection with its surroundings, or at a distance, may 

 match neighbouring objects, and be lost as it were, or 

 at least may obtrude itself less than if uni-coloured, or 



FIG. 35. A "Stick-caterpillar" (Ennomos tiliaria), which in colour, form, and 

 attitude closely resembles a twig of a tree upon which it lives. 



adorned with tints more feebly contrasted. For this 

 reason many tropical insects that take diurnal rest 

 clinging to the bark of dead or fallen trees are not 

 wholly brown ; the brown is delicately mottled with 



