PROTECTIVE RESEMBLANCES, AND MIMICRY 909 
buds or twigs. These caterpillars have a special muscular. 
development to enable them to hold themselves rigidly for 
Fig. 130.—A geometrid larva on a branch. (The Fie. 131.—A walking-stick insect 
larva is the upper right-hand projection from (Diapheromera femorata) on 
the stem.) twig. 
long times in this trying attitude. They also lack the 
middle prop-legs of the body, common to other lepidopter- 
15 
