68 HOW ARE ANIMALS AND PLANTS DEPENDENT? 



'4 k antenna 



..sucking tube 

 How do the structures you found in your specimen compare with these in the diagram? 



away. The female insect, after her marriage flight, deposits her 

 eggs on a milkweed plant. 



Since this butterfly in most parts of the United States has at 

 least two broods a year and since the young feed on the milkweed 

 and dogbane, both common weeds, we see some cause for its 

 wide distribution and great numbers. The metamorphosis of the 

 butterfly is said to be complete because it 

 passes through several distinct changes of 

 form. 



Moths. Moths are familiar to most of us, 

 but they can usually be seen only at night be- 

 cause of their night-flying habits. Certain 

 differences between them and butterflies are 

 noted in the following table : 



Butterfly 

 Antennae threadlike, usually knobbed at tip. 

 Fly in daytime. 



Wings held vertically when at rest. 

 Pupa naked. 



Moth 

 Antennae feathery or threadlike, never 

 knobbed. 



Usually fly at night. 



..simple 

 eye 



true leg 

 Spiracle 



- proleg 



anal ^ 

 proleg 



anal horn. 



Caterpillar of moth. Find 

 the parts of the adult insect 

 here. Does this agree with 

 your definition of an insect ? 



