The Orders of Insects 



on the skin of the host, and with 

 four tiny lobes at the tip. The 

 Lice are insects of flattened form 

 spending their whole lives on the 

 bodies of mammals whose blood 

 they suck. Three species are 

 sometimes found on man. All 

 lice may be included in a single 

 family — the Pediailida (ill)- 



Sub-Order C. Homoptera. 



The Homoptera, including 

 the Cicads, Froghoppers, Plant- 

 lice, etc., are readily distin- 

 guished from the Heteroptera by 

 the slight differentiation of the 

 \\ \] forewings ; sometimes these are 



firmer in texture than the hind- 

 wings, but they never show dis- 

 tinct hard areas like those of the 

 Heteroptera. When at rest the 

 wings slope roofwise over the 

 back, whereas in the Heteroptera, 

 they lie flat. The sub-order is 

 further distinguished by the 

 backward slope of the face, which 

 / \ \ brings the beak into close contact 



with the front haunches (fig. 



, , X x^ 107). The feelers have one or 



/ \ \ a few basal segments thickened, 



^ the rest of the segments forming 



Fig. 106. — Jaws of Petficuhes . 1 i-. j- t l 



vestiiucnti. Highly magni- a thread -like endmg. In the 



fied. From Osborn (after „,,^„-.p ^.f ^\.f^ lifp-hiqt-orv thf 



Schiodte), Bulls (n.s.)Div. nature or rne iire-nisrory tne 



Ent. U.S. Dept. Agr. Homoptcra show an advance on 



the Heteroptera ; the young in several families are 



