176 OTHER MEMBERS OF THE CLASS — INSECTA 



the liristlelike mandibles and maxilla' may be separated 

 from the sheath. ^lany 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 

 squash bug (Fig. 

 116) la}-s its eggs, 

 usuall}', on the un- 

 der sides of leaves. 

 The .young bug 

 passes through fi\"e 

 stages, gradually 

 getting wings and 

 becoming larger, 

 before it I'eaches 

 the adult condition. 

 The harlequin Ixig, or " calico back," or " terrapui bug," 

 as it is \'ariously called, is vny injurious to cabbages, 

 turnips, radishes, etc. Its life history is similar to that of 



Fig. IIG. — Egg.s, nymph, and adult of squash bu 



Fig. 117 



Mr history of a harlequin cabbage bug 

 o, adult. 



nyniph ; 



