CHAPTER IX 



PHYLUM ARTHROPODA, CLASS INSECTA 



(Continued) 



Order 11. Hemiptera. This order includes the "bugs" 

 proper, and no other insects should be called by that name. 

 Bugs are heterometabolous, have sucking mouth parts, and 

 may possess two pair of wings or be without any. There 

 are three suborders: 



Suborder 1. Parasita. This group comprises the lice, 

 which are wingless and parasitic. Lice do a small amount 



A B C 



FIG. 46. Lice. A, eggs of head louse attached to a hair; B, head louse; C, 



body louse. 



of damage by making punctures and sucking blood; 

 but are dreaded chiefly because they may inoculate man 

 with the germs of certain diseases when they pierce the skin. 

 In most parts of the world there are three species which 

 attack man and many more which prey upon other animals. 

 Pediculus humanus is the head louse (Fig. 46). It is 

 found the world over and its color varies somewhat accord- 



95 



