102 



THE REPORT OF THE 



No. 19 



Although the pupa stage is inactive, nevertheless it breathes slightly, 

 acd uses up some of the food which is stored in the body as fat-bodies during 

 the larval stage. Some pupae are naked (Fig. 28), and others are surrounded 

 by a cocoon (Fig. 29), or web, which is spun by the larva. All pupse, how- 

 ever, are invested in a more or less tight-fitting case. With some, the case 

 covers the body loosely, but in others, the outlines of every external structure 

 ire clearly shown. 



Life History : The life-historj' of an insect means simply the life story, 

 that is, "all the changes it goes through, and all that it does from the time 

 it hatches from the egg, or is born, until it dies of old age." It becomes an 

 important matter to learn the whole life story when we wish to combat in- 

 jurious insects, for very frequently there is a stage (not always the same stage 

 for all insects), when they are most easily attacked and destroyed. 



Fk;. 28. Pupa of an W,d^HKffi'JI'l 



Archippus but- >ii ■'W^miMMtmt 



terflv. 



Fk;. 29. Pujia in a cofoon. Fu;. 30. Two-wingt'd Hy (Dipt era). 



CLASSIFICATION OF INSECTS. Insects are, for convenience of study, di- 

 vided into Orders, named according to the natures and number of the wings. 

 Only seven orders will be discussed here, as nearly every insect of economic 

 importance belongs to one of the seven : 



1. AVith two wings Diptera. (Fig. 30). 



2. With four wings : 



A. Upper and lower wings similar in texture. 



a. All wings scaly Lepidojytera. (Fig. 31, 32). 



b. All wings naked or a little hairy : 



(1) Wings many veined Neuroptera. (Fig. 33). 



(2) Wings few veined Hymenoptera. (Fig. 34) 



B. Upper and lower wings unlike in texture. 



(a) Mouth-parts formed for snckmg.. Me niiptera, Hetcroptera, 

 (Figs. 19 and 20). 



