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ORDERS OF INSECTS 



nished with a sting, piercer or "saw." The metamorphosis is 

 complete (Fig. 25). 



The honey-bee is a good example of this order, which also in- 

 cludes the true ants, the wasps, hornets, and sawflies. A large 

 number of parasites which attack injurious forms of insects are 

 also found here. 



Order Hemiptera. This order includes all the plant lice, the 

 true parasitic lice, all the scale insects, and the true bugs (Fig. 26). 

 The name Hemiptera, which means " half-winged," is given the 

 entire order because the anterior half of the first pair of wings in 



FIG. 25. Hornets, with larva, pupa and cells. 



the true bugs is thickened, only the posterior part being wing-like. 

 The mouth parts are formed for sucking, and they have an incom- 

 plete metamorphosis. This is probably our most destructive order, 

 for here occur scale insects, plant lice, leaf hoppers and tree hop- 

 pers, squash bugs, Cicadids or harvest flies, and the true lice which 

 affect man and animals. It is interesting to note that the word 

 "bug," which is frequently employed to designate any insect, is 

 rightfully applied only to that division of the Hemiptera which 

 are "half -winged," sub-order Heteroptera. 



Sub-order Homoptera. Scale insects, plant lice and mealy bugs 

 belong to the sub-order Homoptera. At some stage these have 

 gauze-like wings. 



