To the Teacher: These illustrated studies require slower and more careful study than the text. One, or at most two, 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.
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Fig. 145.—Scales on Moth's Wing.
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Fig. 146.—Head of Butterfly.
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Fig. 147.—Section of Proboscis of butterfly showing lapping joint and dovetail joint.
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Fig. 148.—Head of Butterfly (side view).
Figs. 141-148. Illustrated Study of Lepidoptera.—Study
the stages in the development of codling moth, silkworm 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 antennæ 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 antennæ 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 butterfly 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.
