17() OTHER MEMBERS OF THE CLASS — INSECTA 



the ))ristk'likc mandibles and niaxilhi? may be separated 

 from tlie shcutli. Many of the bugs are injurious to farm 

 crops. They insert the mouth parts into the tissues of plants 

 and suck out the juices, thus weakening, if not killing, 



the plants. The 

 scjuash bug (Fig. 

 116) lays its eggs, 

 usually, on the un- 

 der sides of leaves. 

 The young bug 

 passes thi'ough five 

 stages, gradually 

 getting wings and 

 becoming larger, 

 before it reaches 

 the adult condition. 

 The harlequin bug, or " calico l_)ack," or " terrapin bug," 

 as it is variously called, is ^-ery injurious to cabbages, 

 turnips, radislies, etc. Its life liistoi'v is sinular to that of 



Fig. 116. — Eg^s, iiyniph, and ndult of sijiki^^Ii bu;^ 



liafluqiiin cahli; 

 a, adult. 



