INSECT PESTS 163 



louse depositing her eggs within its tissue. 

 When the female Aphiduis comes in con- 

 tact with an aphis, she quickly thrusts her 

 abdomen beneath its thorax and head, giv- 

 ing the aphis a quick stab, and deposits her 



FIG. 36. Aphiduis testaceipes ovipositing in the body of 



AN APHIS. ENLARGED. (AFTER WEBSTEE.) 



eggs in its body. After being stung by her 

 enemy, the aphis kicks up the posterior 

 part of the abdomen as though in pain. 

 It is probable that only one egg is depos- 

 ited within the body of each attacked aphid. 

 The egg upon hatching gives birth to a 

 small legless larva which begins at once to 

 feed upon the interior vital parts of the 

 louse. The latter soon becomes less active, 



