140 BRANCH ARTHROPODA 



The tree crickets live in trees or on tall plants. The female " snowy 

 tree cricket " does much damage by laying her eggs in grapevines or rasp- 



Fig. 110. — Potato injured by mole cricket. 



berry canes, causing them to die above the puncture. These canes should 

 be cut and burned in winter or early spring before the eggs hatch. 



ORDER VII. HEMIPTERA 



This order contains some of our most common and destruc- 

 tive insects, as the chinch-bug, the grape phyllox'era, the San 

 Jose scale, the bed-bug (Fig. HI), the louse, the squash bug, 

 stink-bugs of various kinds, plant-lice (Aphid'idcB) , and bark-lice 

 (Coc'cidce), which furnish dye-stuffs, as cochineal, stick-lac, from 

 which we get shellac, and China wax. 



The Hemip'tera include some five thousand species in North 

 America. All of these species agree in that the mouth parts 

 are modified into a piercing and sucking beak. Their food, con- 

 sequently, is the blood of men or of other animals or the juices 

 of plants. The sucking beak consists of the labium, which, to- 



