THE PARTS OF A LOCUST. 17 



3. Observe the strong, longitudinal veins, and the 

 numerous smaller cross-veins. 



4. The portions of the membrane bounded by the 

 veins are called the cells. 



5. Cut a piece about one fourth inch square from 

 one of the wings not removed from the body, mount 

 it on a card, and make a careful drawing of the veins 

 and cells. Label the drawing as follows: Fragment 

 of the wing of a locust showing the veins and the cells. 



6. Write a description of the wings of a locust ; 

 describe first the general features of the wings, and 

 then state how the two wings of one side differ from 

 each other. 



LESSON VI. 



THE PARTS OF A LOCUST (CONTINUED). 



The Thorax. 



1. In this lesson we are to study the parts of the 

 thorax, but before beginning this study the pupil 

 should examine the abdomen and observe that the 

 body wall of that region is composed of several ring- 

 like segments. 



2. Like the abdomen, the entire body of an insect 

 is made up of a series of segments, but it is not so 

 easy to distinguish the separate segments in the head 

 and thorax as it is in the abdomen, 



3. The segments of which the head is composed 

 are grown together so completely that the head ap- 

 pears to consist of a single segment. 



4. The thorax consists of three segments, which 

 we will try to distinguish. Observe that the first 

 pair of legs are borne by a ringlike part which can 



