Illustrated Studies 



87 



TO THE TEACHER: These illustrated studies require 

 slower and more careful study than the text. One, or at 

 most frvo, studies will suffice for a lesson. The questions can 

 be answered by studying the figures. Weak observers will 

 often fail and they should not be told, but should try again 

 until they succeed. 



Figs. 141-148. Illustrated Study of Lepidoptera.— 

 Study the stages in the development of codling moth, silk- 

 worm moth, and cabbage butterfly. 



Where does each lay its eggs ? What does the larva of 

 each feed upon ? Describe the pupa of each. Describe 

 the adult forms. Find the spiracles and prolegs on the 

 silkworm. Compare antenna of moth and butterfly. 

 Which has larger body compared to size of wings ? 



Describe the scales from a butterfly's wings as seen under 

 microscope (144). How are the scales arranged on moth's 

 wing (145) ? By what part is scale attached to wing? Do 

 the scales overlap ? 



Study butterfly's head and proboscis (Figs. 146-148). 

 What shape is compound eye ? Are the antennae jointed ? 

 Is the proboscis jointed ? Why not call it a tongue ? 

 (See text.) 



Which mouth parts have almost disappeared ? What is 

 the shape of cut ends of halves of proboscis ? How are 

 the halves joined to form a tube ? 



If you saw a butteifly on a flower, for what purpose 

 would you think it was there? What, if you saw it on a 

 leaf? How many spots on fore wing of female cabbage 

 butterfly? (Fig. 124, above.) 



Does the silkworm chrysalis fill its cocoon ? Eggs may 

 be obtained from U. S. Dept. of Agriculture. 



Fig. 145.-81 vles 

 on Moth's Wing. 



Fig. 146. — Head 

 of Butterfly. 



Fig. 148. —Head 

 of Butterfly 



(side view). 



Fig. 147. — Section 

 of Proboscis of 

 butterfly showing 

 lapping joint and 

 dovetail joint. 



