214 



Maine Agricultural Experiment Station. 1917. 



extreme rapidity. In no case did the adults attempt to orient 

 themselves against even a light breeze. During a calm spell no 

 c mentation took place and the fruit flies darted off in all directions. 



Three hundred trypetids were liberated in four different 

 marked lots, containing from 50-150 specimens. Each lot was 

 set free from a different locality at a varying distance from a 

 commercial currant and gooseberry garden consisting of 100 

 bushes. One person collected currant fruit flies daily in shady 

 localities in this garden. During the season 2188 adults were 

 caught and of this number 17 were marked individuals from the 

 300 that had been released. All of the 17 marked insects were 

 captured during the first 15 days after the experiment had been 

 started. 



Table 19, shows the dates on which the fruit flies were 

 released, the number of doubly marked trypetids in each lot, 

 the direction of the wind at the time of liberation, the distance 

 from the point of liberation to the commercial currant and 

 gooseberry garden and the dates on which marked specimens 

 were captured : 



TABLE 19. 



Data on Experiments With Marked Currant Fruit Flies. 



Dates of 

 liberation 



Number of 



flies 



liberated 



Leg cut; 



color of 



ink 



Direction 

 of wind 



Distances 

 flies were 

 captured 



Dates marked 

 flies were 

 captured 



June 13 P. M. 



1155 

 SSd" 



150 



Right middle 

 leg; yellow 



Heavy S. W. 



3290 ft. 



June 16, 15 

 18, 15 



2 



14 P. M. 



505 



Left iiind 

 leg; scarlet 



Light S. E. 



2650 ft. 



16, 1 

 29, 1 



2 



15, 1 



16, 1 

 21, 1 



25, 1 



26, 1 



14 A. M. 



505 



Left middle 

 leg; indigo 



Light N. W. 



1115 ft. 













5 



18 P. M. 



505 



Right hind 

 leg; indigo 



Oalm 



300 ft. 



19, 1 



22, 3 



23, 1 

 25, 2 

 28, 1 



8 



