DIPTERA. 89 
| olives that are left, or in the earth, according to the climate, 
are still in these fruits. Ifa 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 time of gathering the olives, sufficient time is 
| left for the larvee of the dacus to eat into their parenchyma, 
| which takes away the little oil that they might have given 
if they had been destroyed. This early gathering has also the 
advantage of causing the destruction of a great number. of larve, 
which will be so much towards diminishing the means of repro- 
duction of the fly. 

