1912] Mediterranean Fruit Flies 405 
with the wind and in this case flew up the valley towards the 
mountains. In no case did the fruit flies attempt to orient 
themselves against even the lightest breeze. During calm 
spells no orientation took place and the flies darted off in all 
directions. 
From time to time some of the kerosene traps were moved 
farther and farther into the city of Honolulu and were again 
hung among the branches of fruit bearing trees, usually citrus 
trees. These traps were visited every day, the fruit flies 
captured in a trap were put into a vial labeled as to the location 
of the trap. The kerosene was renewed daily in each trap. 
The varying climatic conditions under which the different 
lots of flies were set free are indicated in the following table: 
TABLE I. 
No.Gr Conditions of weather at time of Total pptd. 
é liberation 
Date| Flies| Leg Ws: 
Lib- Cut Weather 
erated Winds | Precipitation Report 
Feb. 
21 500 | Hind | Heavy N.E. | Frequent heavy rains 2 
24 600 | Front | Light N. E. Light rains, occasional 
heavy showers. 1.12 
25 200 | Front Gusts of N. E.| No rain. .26 
an 
Calm Spells 
26 200 | Front Light N. E. No rain. 21 
and 
Calm Spells 
29 500 | Middle | Moderate No rain. .00 
S. W. 
The total number of fruit flies captured during one month 
in the fifty kerosene traps was two thousand three hundred 
and nine, of this number one hundred fifteen were marked 
specimens from the two thousand that had been liberated. Of 
the marked individuals captured there were seventy-three with 
the front leg cut, eleven with the middle leg and thirty-one with 
the hind leg. Most of the one hundred fifteen marked insects 
were captured during the first fifteen days after the experiment 
had been started. 
