DIPTERA. 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 olez. 
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 
hundred eggs which she bears.”’ 
Fig. 66, taken from the memoir published by M. Guérin- 
