76 INSECT LIFE. 



tributed among three suborders, which can be sep- 

 arated by the following table : 



A. Wingless Heraiptera, parasitic upon man and other mammals, with a 



fleshy unjointed beak II. PARASITICA. 



AA. Hemiptera with or without wings, but with a jointed beak. 

 B. First pair of wings thickened at the base, with thinner extremities, 

 which overlap on the back ; beak arising from the front part of 



the head (Fig. 58) I. Heteroptera. 



BB. Wings of the same thickness throughout, and usually sloping at 

 the sides of the body ; beak arising from the hinder part of the 

 lower side of the head (Fig. 59) III. Homoptera. 



Suborder He^^optera (Het-e-rop'te-ra). This 

 suborder includes the true bugs, of which the squash- 

 bug (Fig. 60) and the common 

 stink-bugs (Fig. 6i) are well- 



FiG. sg.— Head 

 Fig. 58. — Head of an hete- of an homopte- 

 ropterous insect. reus insect. 



Fig. 60.— The Fig. 61.— A 

 squash-bug. stink-rbug. 



known examples. Several families of this suborder 



are discussed in the chapters on Pond Life and on 



Brook Life. 



Suborder Parasita (Par-a-si'ta). — This suborder 

 is represented in the United States by only 

 one family, the Pediculidae (Ped-i-cu'li-dae). 

 This family comprises the true lice (Fig. 62), 

 which differ from the bird lice of the order 

 Mallophaga in having sucking mouth parts. 



-A louse! The true lice live on the skin of mammals 



