1918 ENTOMOLOGICAL SOCIETY. 59 



for. In testing a sample of fuel oil we want one that will spread readily, will make 

 a nice complete coating on the water, and will stay at least a week. But even 

 at the best, oil is only a temporary measure. 



A hearty vote of thanks, moved by Prof. Caesar and seconded by Peof. 

 TjOCHHead, was extended to the speaker in appreciation of his lecture. 



Mr. a. p. Winn then delivered the President's Address on "The Bladder- 

 scales of Lycaenidse.'' 



After the evening session, a smoker was held in the Men's Eesidence, when 

 an extensive discussion on " Canadian Entomologists and the War " took place. 

 The discussion was taken part in by Prof. Lochhead, Mr. Winn, Dr. Headlee, 

 Prof. Burgess, Prof. O'Kane, Prof. Caesar, Prof. Brittain, Mr. Gibson, Mr. 

 Petch and others. 



FEIDAY MORNING, 9 O'CLOCK. 



After a short business meeting at which the officers for the ensuing year 

 were elected, Prof. Caesar, the newly appointed President, took the chair and in a 

 few words expressed his thanks and appreciation of the honor done him. 



Mr. Winn extended an invitation to members and visitors to visit the Lyman 

 Entomological room at McGill Universitv. 



THE BLACK CHERRY APHIS. 



William A. Ross, Dominion Entomological Laboratory, Vineland 



Station. 



The experiments on which the following paper is based were carried on this 

 past season at the Dominion Entomological Laboratory, Vineland Station, Ontario. 

 The aphis was studied both in the insectary and in the orchard. In the insectar}- 

 (a covered bench, situated out-of-doors) the plant lice were reared on small 

 sweet cherry trees and Lepidium plants grown in flower pots. 



As we have not had time to prepare technical descriptions of the various 

 forms, only popular descriptions are included in this paper. 



History. 



The black cherry aphis has long been known in Europe and North America 

 as a pest of cherry trees. On this side of the Atlantic the species was first 

 recorded in 1851 by Fitch (Cat. Homopt. N.Y. 65, 1851). The same author 

 in a later publication (Rep. Ins. N.Y. 1, 125, 1855) describes the insect and 

 gives an interesting account of its habits. He suggests that it was introduced 

 into America with the tree which it infests. What is probably the first reference 

 to M. cerasi in Canadian literature is contained in Fletcher's Report of the 

 Entomologist, 1885. Mention is merely made of the occurrence of aphids on 

 young cherry trees at Victoria V. I. — no name or description is given. In the 

 Entomologist's Report for 1897, Dr. Fletcher gives the following interesting 

 observations made by Mr. Martin Burrell, at that time of St. Catharines. Ont. :— 



