356 ANIMAL STUDIES 



buds or twigs. These caterpillars have a special muscular 

 development to enable them to hold themselves rigidly for 



FIG. 216. A geometrid larva on a branch. (The FIG. 217. 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- 



