THE EXTERNAL ANATOMY OF THE LOCUST 281 



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Exercise 10. Make an enlarged drawing of the side view of the abdomen of 

 the male locust, showing all of the above parts. 



2. Abdomen of the female. The abdomen of the female from the 

 first to the seventh segment is nearly the same as in the male. 



a. Segment eight. This segment resembles the other segments, 

 except that the sternum is nearly twice as long, and is known as 

 the subgenital plate. 



b. Segments nine, ten, and eleven. These are essentially like 

 those of the male, the tergum of nine and ten being partially fused, 

 and tergum eleven forming the terminal, dorsal shield. 



c. The cerei and podical plates. These plates are similar to 

 those in the male, except that the podical plates are much more 

 prominent. 



d. The oviposit or. The ovipositor consists of three pairs of 

 movable plates. The dorsal pair lie just ventral to the eleventh 

 tergum and are long, lance-shaped pieces with hard, pointed tips. 

 The ventral pair arises just dorsal to the eighth sternum and 

 resembles the dorsal pair. When these four pieces are brought 

 together, their points are in contact, forming a sharp organ by 

 means of which the female bores the holes in the ground in which 

 to deposit her eggs. The third set of plates are known as the egg 

 guides. These are much smaller and are located median to the 

 plates of the true ovipositor. 



Exercise 11. Make a drawing of the side view of the last five segments of 

 the female locust. 



