GRASSHOPPERS IN GENERAL. 



47 



FIG. 27. (Original.) Side view, 

 showing spiracle of mesothorax with 

 spiracle enlarged, 



however, there are organs es- 

 pecially made to assist in 

 buoying the insect when on 

 the wing. These are com- 

 monly known as air sacs, and 

 / connect with the spiracles as 

 / shown in the figure (fig. 26). 



Reproductive system. Fig. 25 shows the reproductive organs of 

 the female, when not laden with eggs. It consists of an ovary, egg 

 duct, and receptacle for the fertilizing fluid. Fig. 28 shows the ovary 

 of the female just a few days previous to the time of oviposition. It 



FIG. 28. (Original.) Reproductive system of female. Large egg sac lying above stomach ; ovi- 

 duct leading out above egg guide ; r, rectum ; a-a, digestive tract. Enlarged three times. 



is believed that, in these insects, each egg is fertilized in passing from 

 the ovary out through the egg duct. The number of eggs that the 

 ovary of this insect will contain averages about 100. 



Nervous system. The nervous system is shown in Fig. 25. It con- 

 sists of a series of ganglia, or collections of nervous matter, situated 

 under the digestive canal. These ganglia are arranged along the body 

 just next to the digestive tract. They are placed two together, and 



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