DIPTERA. 89 
olives that are left, or in the earth, according to the climate, 
are still in the fruit. If a first operation were not sufficient 
to destroy them all, it should be repeated the following year. 
The sacrifice entailed by this practice would be amply com- 
pensated by a succession of good crops and the certainty of 
a sure and permanent profit. In fact, by an early gathering 
at least half a crop of oil is still obtained; whereas by waiting 
for the usual period of gathering the olives, sufficient time is 
left for the larvee of the Dacus to devour their parenchyma, which 
deprives them of the little oil that they might have yielded if 
their destruction had been accomplished earlier. This early 
gathering has the advantage of causing the destruction of a great 
number of larvae, which will be so much towards diminishing the 
means of reproduction of the fly. 
