12 



GENERAL ZOOLOGY 



On the union of these two cells the egg cell is said to be 

 fertilized, and the growth of a new individual is begun. Oc- 

 cupying a considerable part of the posterior portion of the 

 abdomen of the female are the ovaries (Fig. 3), two sets of 

 delicate tubular organs, in which the egg cells are developed. 

 These are connected with the surface by the egg tube, or 

 oviduct (Fig. 3). In the male the sperm cells are formed in 

 organs called spermaries, a tubular mass in the third, 



Fig. 4. Rocky Mountain grasshopper laying eggs. (About natural size) 



A, B, female laying eggs; C, diagram showing the arrangement of eggs in the 

 hole ; D, mass of eggs removed from hole and part of covering taken away ; E, 



few eggs separated. (After Riley) 



fourth, and fifth abdominal somites. After fertilization the 

 eggs are covered on the way down the egg tube by a sticky 

 substance poured out from the cement gland (Fig. 3). This 

 gland opens into an enlarged pouch, or bursa (Fig. 3), which 

 rests on and opens directly into the oviduct. 



Development. The eggs of the red-legged grasshopper are 

 laid in the autumn in holes made by the ovipositor of the 

 female, in the ground of fields, pastures, and waysides. 

 They differ in no important respect from the eggs of the 

 Rocky Mountain grasshopper shown in Fig. 4. Each hole 

 contains from twenty to thirty-five eggs. A secretion from 



