i6 



ENTOMOLOGY 



FIG. 26. Chrysopa 

 plorabunda. Slightly 



reudced. 



minating in a bladder -like organ. Wings present, rudimentary or 

 absent, the two pairs narrow, equal, similar, with few or no veins and 

 fringed with long hairs. Abdomen with ten segments. Minute, slender 

 insects, known as "thrips." Example, Euthrips (Fig. 22). About 

 two hundred species have been described. 



10. Hemiptera. Metamorphosis direct. Antennae usually few- 

 segmented. Mouth parts suctorial. Prothorax usually large. Wings 



usually present, except in the parasitic forms. 

 Eighteen thousand species. Two suborders. 



Suborder Homoptera. Head deflexed. Wings 

 four, sloping roof -like, similar and membranous 

 or fore pair somewhat coriaceous (leathery) 

 throughout. Wings absent in female Coccidae ; in 

 males, fore wings present, hind wings absent, 

 represented by halteres. Phytophagous insects. 



Example, Cicada (Fig. 209). Six thousand species. 



Suborder Heteroptera. Head free, not deflexed. Antennae often 



long, few-segmented. Prothorax free. Wings four (sometimes reduced 



or absent) folded flat; fore wings thickened basally, membranous 



apically (hemelytra), overlapping obliquely; hind wings membranous, 



with large anal area. Terrestrial or 



aquatic. The true "bugs." Example, 



Benacus (Fig. 23) . About twelve thousand 



species. 



11. Parasita. 1 Metamorphosis direct. 

 Wingless parasites. Eyes simple or absent. 

 Antennae short, three- to five-segmented. 

 Prognathous. Head with a short tubular 

 beak, crowned with hooks, containing 

 a delicate protrusible sucking tube. Tho- 

 racic segments intimately united. Tarsus 



with a single claw. Integument thin. The sucking lice, blood-sucking 

 parasites of mammals, represented by the "cooties." Example, Pedicu- 

 lus (Fig. 24). Some fifty species are known. 



12. Coleoptera. Metamorphosis indirect. Ocelli usually absent. 

 Antennae of various forms, with segments varying in number (two to 

 twenty-seven) but commonly ten or eleven. Mouth parts mandibulate. 

 Prothorax large, free. Two pairs of wings ; fore pair horny or shell-like as 



1 Various names have been used for this group, but the name which has priority and 

 is sanctioned by longest usage is Parasita (Latreille, 1796). 



FIG. 27. Bittacus strigosus. 

 ural size. 



Nat- 



