1915 ENTOMOLOGICAL SOCIETY. Ill 



20th, with arsenate of lead alone, 3 lbs. to 40 gals, of water. This was so hadly 

 infested that cages on the ground indicated that nearly 700 adults emerged to a 

 tree in parts of the orchard. 



Results. — The flies were never seen copulating or egg laying, and at picking 

 time the Montmorencies were entirely free from worms. May Duke and Morello 

 li^d much less than one per cent, wormy fruit on the worst infested trees. It is 

 believed the flies that laid these flew in from a few badly infested trees about 200 

 yards away. 



Check orchards not any worse infested the previous year showed 30 to 95 per 

 cent, of wormy fruit. 



Important Points to Remember. 



1. The spray must be put on early enough to kill the flies before they are old 

 enough to lay eggs. They begin to lay in about 10 days, therefore great prompt- 

 ness is necessary, 



2. All those who tried to control the pest with one application where it liad 

 been bad the previous year failed, hence two are necessary. 



3. 'Cultivation is useless as a means of control. 



4. Useless cherry trees should be cut down and burned. 



5. The co-operation of neighbors should, where possible, be secured. 



The President : 1 am very pleased that Mr. Caesar gave us this account of the 

 conclusion of the work on the fruit flies, of which we have had interesting accounts 

 from year to year. He did not mention anything about the distribution of the fruit 

 fly elsewhere. 



Prof. Caesar: I wrote to British Columbia a year ago, and they have no re- 

 port now of any orchard in which either of these species is present. The black- 

 bodied species was originally discovered in British Columbia. Mr. Good, who has 

 been in Nova Scotia and is now working with Prof. Brittain, says that he has seen 

 none in that province. 



Prof. Brittain : A Mr. Chesley Allan sends a report and says that he has 

 found a cherry fruit fly, but tliey would not let him have it. I told him that the next 

 time I went down I would look it up. 



The President : It would be likely to occur there on account of the large num- 

 ber of cherries grown there. 1 am almost sure that it occurs in Quebec. Tliere is 

 a dipterous larva which affects cherries down there. I should like to ask you by 

 what means you differentiate the different larvae ? 



Prof. Caesar : The larvae may be separated by the little hooks. Mr. Spencer 

 has worked on this a good deal and he finds that on the concave surface, the under 

 surface, there is a little projection or lobe in one species not found on the other. 

 There are apparently some other very minute differences in the structure of the 

 cephalopharyngeal skeleton. 



The President: Did he compare the characters of the anal spiracles? 



Prop. Caesar: Yes, but tliey do not help. It is very hard to distinguish the 

 larvae, no matter how carefully you examine them, even under microscope. 



The President : You said that the adults lived up to about a month ; how did 

 you keep them? 



Prof. Caesar: We enclosed whole trees in cages. 



The President : Did you try to keep the adults in tubes ? 



