INSECTS. 



121 



Many different articles of food are now manufac- 

 tured from grain and put up in packages. If such 

 foods are made of uninfested stock and sealed 

 immediately in insect-tight cases, the articles can 

 be kept for a long time. All insects hatch from 



WOOLLY APHIS OF THE APPLE. 



a, agamic female ; b, larval louse ; c , pupa ; d, winged female (with 

 enlarged antenna above.) 



eggs; so, if the box containing the food is sealed 

 tightly with paper, or similar material, so that the 

 adult cannot lay its eggs in it, none will hatch and 

 the food will be safe. Many such articles are now 

 put up in small pasteboard boxes and carefully 

 sealed over with a thin covering of paper. 



