314 ZOOLOGY 



Illinois. Thus, at this very early period, the true 

 Orthoptera were in process of evolution, while the cock- 

 roaches had already started on a separate path of their 

 own. When we see a cockroach, however little we 

 like its appearance or odor, we owe it a certain respect, 

 as belonging to one of the very oldest families in the 

 land. 



insect music ' 2. The true or typical Orthoptera nearly always 

 have the hind legs enlarged, and consequently the 

 power of jumping ; they also chirp in various ways, 

 and appear to have been the inventors of music, coming 

 into existence long before there were any singing birds. 

 Their cries differ greatly according to the species, 



From Brehm's " Thierleben" 

 FIG. in. A group of cockroaches, showing individuals in various stages of growth. 



