DIPTBRA. 



87 



these rumous larvae, which generally destroy two crops out of three. 

 We will borrow the following details from this learned entomologist : 



Fig. 66. — Olives attacked by Dacus oleae. 



" At the time when the olives are formed the Dacus proceeds to 

 place an egg under the skin of each of the fruits. By means of a 

 fetle horny instrument, with which the female is provided, and which 



