54 



NATURAL HISTORY OF INSECTS. 



bug, Fig. 114, a; the Ring-banded Soldier-bug, Fig. 153, c, 

 and the Many-banded Robber, (Fig. 154, b). It usually con- 

 sists of four bristle-like organs (the upper and the lower jaws), 



Fig. 154. 



Fig. 155. 



which are inclosed in the sheath-like lower lip; the upper lip 

 is short and pointed. The transformations are incomplete. 

 This Order is divided into two Sub-orders, as follows: 



Homoptera, (Plant-lice, Vine-hoppers, etc). These insects 

 have the wings of the same- texture throughout, either wholly 

 leathery (as those of the Buffalo Tree-hopper, Fig. 155), or 



Fig. 156. 



Fig. 157. 



wholly membraneous (as those of the Grain Aphis, Fig. 156), 

 and when at rest they are held slanting over the back like a 

 steep roof (as in the Hop Aphis, Fig. 157a); the beak arises 

 from the posterior part of the under side of the head, and 

 sometimes apparently from the breast. 



They are all terrestrial, and are injurious to vegetation. 



