LOCUST 183 



7. The Malpighian or \irinary tubules. — To 



what are they connected ? Are the}'' few or 

 many in number? What is their shape ? Color? 

 How far into the anterior end of the body do 

 they extend? 



The continuation of the ilium forms 



8. The colon.— Position? Shape? Size? Color? 



Structure ? 



9. The rectum. — Compare in all respects with the 



colon. Look for the rectal glands surround- 

 ing the upper end of this portion of the ali- 

 mentary canal. 

 Make a drawing showing a vertical longitudinal sec- 

 tion of the digestive system. 



Examine female specimens for the ovaries and ovi- 

 ducts'. 



h. The ovary. — Position? Shape? Size? Color? Look 

 for eggs. How many are found ? "What part of 

 the body do they occupy? What is their shape ? 

 Size ? Color ? Examine under the low power. 



i. The oviducts. — How many? What is their rela- 

 tion to the ovary? To the posterior portion of 

 the alimentary canal? Where do they open to 

 the exterior? 



In male specimens endeavor to find 



j. The testes and the vasa deferentia. — The former 

 lie on the intestine in the third, fourth, and fifth 

 abdominal segments. Compare these parts with 

 the reproductive organs of the female. 



Tc. The air-sacs. — What is their relation to the tracheae? 

 Look for two very large sacs in the prothorax. 

 What is their position? Shape? Size? How 



