20 INSECT LIFE. 



Note. — In addition to the abdominal spiracles, there are two pairs of 

 spiracles which belong to the thorax ; one of these is situated in the 

 membrane between the prothorax and mesothorax ; the other just above 

 and a little back of the insertion of the middle pair of legs. The first 

 of these two pairs is covered by the free margin of the prothorax, which 

 can be cut away with scissors. 



6. Examine several specimens of locusts and ob- 

 serve that in some the hind or caudal end of the 

 body tapers to the end and bears four pointed and 

 curved, horny pieces, and that in others this end of 

 the body is terminated by a single, large, hood-shaped 

 plate. Those in which the body ends in four pieces 

 are females ; the others are males. 



7. The four pieces at the caudal end of the body 

 of the female are for making holes in the ground or 

 in soft wrood in which the eggs are laid, and are called 

 the ovipositor. 



8. In using the ovipositor the insect pushes it into 

 the ground and then spreads the pieces apart ; by re- 

 peating this operation many times a deep hole is 

 made in which the eggs are laid. 



9. Make a drawing of the left side of the abdo- 

 men ; represent carefully the position of the ear and 

 of the spiracles. Use either a male or female, but 

 state under the drawing which sex it represents. 



LESSON VIII. 



THE PARTS OF A LOCUST (CONTINUED). 



Review. 



The following table illustrates the relations of the 

 parts of a locust that have been studied in the pre- 

 ceding lessons. The pupils should learn this table 



