282 THE CANADIAN ENTOMOLOGIST. 



Hypha7itria. It is to be hoped, therefore, that the divergent type will 

 slowly spread from State to State until it, in connection with other 

 predaceous and parasitic species, will practically relieve us of one of our 

 most prominent arboreal pests. 



Mr. Schwarz stated that it was rather singular that this habit of the 

 species had not been hitherto noticed. 



The Club then adjourned. 



HOWARD EVARTS WEED, Secretary. 



The following papers were not received by the Secretary in time for 

 insertion in their proper places : — 



GALERUCA XANTHOMELAENA POLYGONEUTIC AT 



WASHINGTON.* 



BY C. V. RILEY. 



It will be remembered that at the meeting of the Club a year ago, 

 Professor J B. Smith gave the results of his observations for that year 

 upon the Elm-leaf Beetle at New Brunswick, N. J., and concluded that it 

 was single-brooded there. His observations were so carefully made that 

 his conclusions could not well be doubted ; yet ihey did not agree with 

 those made at Washington, where the species had been found to be at 

 least double-brooded. In the article which I had published upon this 

 insect in Bulletin 6 of the Division of Entomology of the Department of 

 Agriculture, I had discussed the evidence as to number of broods, both 

 from European sources and my own experience ; but Professor Smith's 

 observations were so conclusive, so far as his locality is concerned, that I 

 felt the need of more accurate notes than any that had been published 

 hitherto, and of the desirability of settling the question as to number of 

 broods at Washington by a series of carefully-planned indoor experiments, 

 where, by breeding from one generation to another, there could be no 

 question of an erroneous conclusion. This I have done, and have com- 

 municated from time to time the results to Professor Smith, who has also 

 communicated his to me, and in a general way I may say that the work 

 at each point, so far as I have heard from Professor Smith up to July 28th, 

 appears to bear out the previous conclusions and experience at either 

 point. In short. Professor Smith finds the species to be single-brooded 

 in New Jersey this year, whereas at Washington it is double-brooded as a 



*See page 245. 



