Cinaf(ini( mntojuolojjbt. 



VOL. XXII. LONDON, NOVEMBER, 1890. No. 11. 



PROCEEDINGS OF THE ENTOMOLOGICAL CLUB OF THE 

 AMERICAN ASSOCIATION FOR THE ADVANCEMENT 



OF SCIENCE. 



( Continued from page igg.) 

 The Club met again at 5 o'clock, August 20th. Mr. J. Fletcher pre- 

 sented some notes upon injuries caused by the Hessian Fly, the Wheat- 

 stem Maggot and an undetermined species of Oscinis. He said that the 

 note was presented with the object of eliciting farther information upon a 

 subject which had proved of great interest to him. During the past 

 season he had endeavored to determine the number of broods of the 

 Hessian Fly for the Ottawa district, and had found, first, that the Hessian 

 Fly, the Wheat-stem Maggot and Oscinis were all found at the same time 

 and in the same plant, and further, that, speaking generally, they passed 

 through their stages contemporaneously. Of the three the last had proved 

 much the most destructive. From root shoots of wheat sown on the 14th 

 of April he had bred Hessian Fly and Oscinis at the end of June, and a 

 month later Meromyza had appeared. He had also noticed in some fields 

 at Ottawa that a large quantity of spring wheat was attacked by Hessian 

 Fly in the ground shoots, or stools, in the same manner as fall wheat is 

 attacked in the autumn.' It was frequently the case that on plants which 

 had made from fifteen to twenty stools but one would be left, all the others 

 having been destroyed by the insects. He had procured adult Hessian 

 Flies at Ottawa during this season in the beginning of May, at the end of 

 June, and in August, and they would probably appear again in September. 

 He had not been able to find the Hessian Fly breeding in any of the 

 grasses, and would like to know if others had done so. Meromyza and 

 the Oscinis had been most troublesome pests in the experimental grass 

 patches at Ottawa, some grasses being almost exterminated by them. It 

 was remarkable that the spring appearance of Meromyza had been so 

 enormous as to have caused fear of a serious destruction of the wheat 



