DIPTEEA. 87 



By means of a little horny instrument, with which the female is 

 provided, and which contains a small lancet, she pierces the skin 

 of the olive ; she moves her wings and lays her egg. She after- 

 wards cleans and rests herself, by passing her feet over her head, 

 wings, and other parts of her body. She then flies away and seeks 



Fig. 66. Olives attacked by Dacus olese. 



another olive to deposit in it another egg ; she repeats this opera- 

 tion until she has placed on as many olives the three or four hun- 

 dred eggs which she bears." 



Fig. 66, taken from the memoir published by M. Guerin- 



