296 



COMPARATIVE ZOOLOGY. 



FIG. 265. 



, Water-boatruau (NotonectcC). 



vae and pupsB are active, and resemble the imago. They 

 are nearly all vegetarian. Each family produces charac- 

 teristic sounds (strid illation). The representative forms 



FIG. 266 Seventeen-year Cicada (Cicada sepf ended m): a, pupa; b, the fame, after 

 the imago, c, has escaped through a rent in the back; d, holes iu a twig, where 

 the eggs, e, are inserted. 



