45 



the opening of the bursa copulatrix. It is through this opening 

 that the seminal fluid is received. 



The opening of the vagina is distinct from that of the bursa 

 copulatrix, and ventrad of it. It is on the dorsal aspect 

 of the lobe of the body supported by the last abdominal 

 sternum. 



Return now to the study of your dissection. 



Trace out the course of the duct leading from the sperma- 

 theca and observe that it empties into a pouch ; this is the 

 bursa copulatrix, the external opening of which has been ex- 

 amined already. 



Trace out the course of the vagina and observe that its 

 opening is distinct from that of the bursa copulatrix, as has 

 been pointed out. 



When the eggs are laid they are pushed dorsad past the 

 opening of the bursa copulatrix, in this way spermatozoa 

 coming from the spermatheca can reach them. The egg- 

 shell of insects is perforated at one end by one or more 

 openings, the micropyle through which a spermatozoon passes 

 to fertilize the egg. 



Dissect another specimen, opening it on the ventral side. 



Make a diagram representing the relations of the parts of 

 the reproductive organs of a female locust. 



Review. The following tabular statement will aid the 

 student in making a review of his work on the reproductive 

 organs of a locust, and will serve to indicate the correspond- 

 ence of the parts in the two sexes. He should bear in mind, 

 however, that the reproductive organs of different insects 

 vary greatly in structure. In most insects each testis or 

 ovary consists of many parallel tubes, as in the locust ; but 

 the structure and position of the reservoirs of the products 

 of these organs and the structure of the accessory glands 

 differ greatly in different insects. 



