PROCEEDINGS, 1918 



21 



Cage No. 2: — 17 females and 7 males liberated July 27th. 

 Aug. 2nd, 1 apple, 2 eggs, larvae. 



Cage No. 3: — 31 females and 20 males liberated July 24th. 

 July 30th 1 apple, 2 punctures, 1 egg, larvae 



Aug. 6th 1 



" 9th 1 



" 13th 2 



" 14th 2 



" 15th 3 



" 16th 1 



" 19th 3 



" 21st 1 



"■ 22nd 4 



" 23rd 1 



" 24th 1 



" 25th 1 



22 



1 

 1 

 2 



2 

 8 

 5 

 5 

 1 



10 

 2 

 2 



42 



34 



32 



It will be seen in one cage that an egg was deposited fifteen 

 days after the date of liberation, which, however, failed to 

 hatch. In another cage an egg was deposited after six days, 

 but this also did not hatch. The same is true of the third cage 

 where the first egg to be deposited after a period of six days 

 was apparently infertile. The first fertile egg was laid thir- 

 teen days from the time the adults were liberated. It is in- 

 teresting to note that in this cage the oviposition period extend- 

 ed over almost a month. 



It has been objected that results obtained from captive 

 flies are of no value, since they do not behave normally in con- 

 finement. Realizing the force of this contention we endeav- 

 ored to perform a similar experiment in the open. It was, 

 however, difficult to find a tree in the neighborhood of the place 

 where the experiments were being conducted that was free 

 from the suspicion of natural infestation. Two such trees 

 were finally located, both being isolated in a wood remote fro?n 

 other orchards. The following notes show the result of this 

 work. 



