144 HEMIPTERA. 



also very interesting on account of the length of time 

 spent in the ground by some species while passing 

 through the larval stages, and also because there is a 

 certain resemblance between the aspect of their larvre, 

 which are really hexapod grubs, and the grubs of 

 some Coleoptera having similar burrowing habits. In 

 consequence of this habit the development is highly 

 accelerated and there is no Thysanuriform larval stage, 

 this last having been replaced in the development by 

 adaptive, grub-like stages similar to those common 

 among beetles. 



