INSECTS 



287 



killed, when the parasites pupate. In this way thousands 

 of harmful insects are destroyed (Fig. 202). 



5. Hemiptera. — Jaws forjjpiercing and sucking. "J Wings 



ABC 

 Fig. 193. — The Honey Bee. — From Shipley and MacBride. 



A , Male or drone ; B, female or queen ; C, sterile female or worker. 



alike or different; sometimes absent. Metamorphosis 

 incomplete. Bugs, Lice, Plantlice, etc. The Bed Bug 

 {Cimex lectularius) is without wings, save for vestiges of 

 the first pair, which in other bugs are wing-covers. Its 



FIG. 194. — The Bed Bug, Acanihia ( = Cimex) lectularia.- 

 From Murray, after Butler. 



body is flattened, so that it can hide in crevices, and it 

 secretes from glands a stinking substance. Its eggs are 

 laid in batches in its hiding- places and hatch in about ten 

 days. The young resemble the parents, but have no 

 vestige of win^s. They moult five times, feeding before 



