PROTECTIVE RESEMBLANCES, AND MIMICRY 209 



buds or twigs. These caterpillars have a special muscular 

 development to enable them to hold themselves rigidly for 



FIG. 130. A geometric! larva on a branch. (The 

 larva is the upper right-hand projection from 

 the stem.) 



FIG. 131. A walking-stick insect 

 (Diapheromera femorata) on 

 twig. 



long times in this trying attitude. They also lack the 

 middle prop-legs of the body, common to other lepidopter- 

 15 



