i6 



ENTOMOLOGY 



9. Hemiptera. Metamorphosis direct (excepting male 

 Coccidae). Antennae usually few-jointed. Mouth parts suc- 

 torial. Prothorax usually large. Wings usually present, 

 except in the parasitic forms. Eighteen thousand species. 

 Three suborders : 



Suborder Heteroptera. Wings four, folded flat; front 

 wings thickened basally, membranous apically (hemelytra), 



FIG. 22. 



Benacus griseus. Slightly reduced. 



overlapping obliquely; hind wings membranous. Head not 

 deflexed. Example, Benacus (Fig. 22). About twelve thou- 

 sand species. 



Suborder Homoptera. Wings four, sloping roof-like, sim- 

 ilar and membranous or front pair somewhat coriaceous 

 throughout. Head deflexed. Example, Cicada (Fig. 206). 

 Six thousand species. 



Suborder Parasita. Wingless. Eyes simple or none. 

 Thoracic segments intimately united ; tarsus with a single 

 claw. Integument thin. Parasites upon mammals. Exam- 

 ple, Pediculus (Fig. 23). Some fifty species are known. 



10. Neuroptera. Metamorphosis indirect. Antennae con- 



