PR01U.EM 11 ;i7 



a. Eggs 



Method and Observations. — In the field look on the inidcr side 

 of leaves for tiny ovoid structures {('(jy.s) of mot hs Mrid hiitlerfiies. 

 The eggs of the cabbage butterfly may be found at almost any 

 time on the under side of cabbage leaves. 



Conclusion. — Why are the eggs laid on the //.////tr side of 

 certain leaves? 



b. Larva or Caterpillar 



Observatipns. — Note that, besides true jointed logs, tlu^ 

 caterpillar has others called prolegs. Ht)\v many true legs ar(» 

 there and where are they located? How many prologs are there? 



Locate the spiracles or breathing holes. Remember wlicre 

 they are located on an adult insect. 



Watch the caterpillar when it feeds. AVhat kind of mouth 

 parts does it have? Might it do damage to plants? How".' 



Conclusion. — 1. Is a caterpillar a worm? (Look in your bi- 

 ology for the characteristics of worms.) 



2. How might the larvae of moths or butterflies l)e of economic 



importance ? 



c. Pupa 



Materials. — Cocoons of several species of moths with twigs or 

 other parts attached should be furnished for this exercise. 



Note. — Moths spin a cocoon for themselves at this stage. Huttcrflics spin no 

 cocoon but form a chrysalis. 



Observations. — Where do you find the cocoon or chry.salis? 



Of what does the cocoon seem to be compo.sed? (Tlie cocoon of 

 the Cecropia is excellent for this purpose.) 



In a chrysalis locate by means of the body markings the head, 

 antennae or feelers, eyes, wings, legs, and spiracles. Are all the 

 parts of an adult present? 



Open a cocoon. What do you find insid(^'.' Hnw do you explain 

 this? 



Conclusion. — Making use of all the knowledge you have 

 gained, write a brief description of the i)ui)al stage of an in.sect and 

 tell of what use this stage might be to the insect. KcMiiember 

 where you find these stages. 



