THE GRASSHOPPER 33 



The Reproductive System. — The ovaries and egg 

 masses of the female have been mentioned but if the time 

 is not favorable so that the eggs are prominent it will be 

 best to study the organs in connection with this subject. 



In the female, find the whitish ovary on either side of 

 Ihe alimentary canal, and two white oviducts leading down 

 to the opening in its ovipositor. 



Make a drawing of the ovary and and oviducts (X2). 



In the male, find two elongated whitish bodies, the testes, 

 and leading from them the vas deferens, two narrow tubes 

 extending to the opening near the arms. 



Make a drawing of the testes and the vas deferens (X2). 



The Nervous System. — (i) Remove the ahmentary 

 canal carefully and notice the white string in the bottom 

 with occasional knots upon it. This is the nervous system 

 and consists of cords and ganglia. 



(2) Above the esophagus find a large supra-esophageal 

 ganglion sending nerves to the eyes and antennae, and below 

 the esophagus, in front of the prothorax, and infra-esopha- 

 geal ganglion which sends cords to the mouth and forelegs. 

 From the first of these ganglia there are two cords, one pass- 

 ing on each side of the esophagus to the second. 



(3) Then find one each in the divisions of the thorax, 

 somewhat larger than the first. These are the thoracic 

 ganglia. 



Study these and see if you can trace cords to the wings 

 and legs. 



Do you find ganglia in the abdominal region? 



How many? 



In what segments are they? 



Make a drawing of the entire nervous system (X2). 



STU. IN ZOOL. — 3 



