l6 INSECT LIFE. 



as the femur, but it is more slender ; it is called the 

 tibia {tib'i-d). This name is the same as the name of 

 the principal bone between the knee and ankle of the 

 human leg. 



6. All of the leg of the locust beyond the tibia is 

 the foot or tarsus {tar'sus). This part consists of 

 three segments in the locust, but the number of seg- 

 ments in the tarsus differs in different kinds of in- 

 sects. 



7. The last segment of the tarsus bears a pair of 

 claws. These are called the tarsal claws. 



8. Find each of the parts named above in each of 

 the legs of the locust. 



9. Make a drawing of one of the fore legs and 

 name the parts. 



10. The plurals of the terms are as follows : coxa, 

 coxae ; trochanter, trochanters ; femur, femora (fem'- 

 o-ra) ; tibia, tibiae ; tarsus, tarsi. 



LESSON V. 



THE PARTS OF A LOCUST (CONTINUED). 



The Appendages of the Thorax, the Wings. 



1. Remove the two wings of one side, spread 

 them out on a card, and gum them in place. 



2. Study the wings and observe that each is com- 

 posed of a membrane strengthened by a framework 

 of thicker lines. These thickened lines composing 

 the framework are called the veins of the wings. The 

 term vein used in this connection is not very appro- 

 priate, but as it is in general use it would not be well 

 to attempt to change it. 



