112 ELEMENTARY LESSONS ON INSECTS 



11. Home problems on crop pests (see p. 174). 



12. Routine (see p. 204). 



LA BORA TOR Y PROGRA M 



A. The Study of Living Material. 



Little can be done with adult moths and butterflies in- 

 doors, but living larvae are excellent subjects for observa- 

 tion. 



1. Note their locomotion, and the use of legs and prolegs. 

 This will be different in loopers and in ordinary cater- 

 pillars. 



2. Note in some leaf-eating moth larva the spinning of a 

 thread by it wherever it goes; and if chance offers, 

 then watch the spinning of a cocoon when it is full 

 grown. 



3. Note the feeding upon a leaf, and the use of the jaws 

 and feet. 



4. Take a living pupa in hand and by examining it care" 

 fully determine how much of its body is freely movable' 

 and how much close-sealed. 



B. The Study of Preserved Material. 



I. With an adult moth or butterfly in hand rub some scales 

 off from it with your finger, dab them on a glass slide and 

 examine them with a microscope. 



Compare this specimen in form and arrangement of parts 

 with the insects previously studied; and then note further: 



