284 THE CANADIAN ENTOMOLOGIST. 



Thus, as stated, there can no longer be any question that the species 

 at Washington is double-brooded as a rule, and that it produces excep- 

 tionally a third and even a fourth generation. Yet during the latter part 

 of July we have at Washington very much the same condition of things in 

 the abundance of the larvae and the injury of the trees from the second 

 generation as they have at New Brunswick, N. J., from the first generation. 

 I give below a detailed record of the observations made the present year, 

 as noted by Mr. Theo. Pergande, who had charge of the experiment, 

 though I have personally watched over and superintended the breeding 

 and can confirm the accuracy of the record. Before leaving the subject, 

 it may be well to note that in the fouith edition of the European Cata- 

 logue of Coleoptera, as pointed out to me over a year ago by Mr. John 

 Hamilton, the nomenclature of this species is given as follows : 



Galericca luteola MiilL, Mil. Turin 3, 187. 

 xanthomelcena Schrank, Ws., 627, 

 cahtiariensis Fab., Gyll. Ins. 3, 508. 



There seems no other course than to follow the resurrectionists and to 

 change the name that has already become so familiar to us once more in 

 favor of luteola, unless we hold by the 20 years limit promulgated and 

 discussed in the rules for entomological nomenclature considered in the 

 early history of this Club. 



STATEMENT OF EXPERIMENTS WITH THE ELM-LEAF BEETLE. 



HIBERNATED OK FIRST GENERATION OK BEETLES. 



May 3, '92. — Beetles now swarming and quite abundant on some of the Elms on 

 the grounds of the Department of Agriculture, eating the characteristic round holes in 

 the leaves. 



May 6, '92. — First eggs noticed. 



May 20, '92. — A few batches of eggs hatching. A lot of young larva; are placed in 

 vivarium. Marked also 8 colonies for outdoor observation. 



May 27, '92. — LarvK are casting first skins. 



June 6, '92 — Larvffi are casting the second skin. 



June 8, '92. — One Larva has changed to pupa. Larvit on branches which were 

 marked, May 20th, are leaving and descending the trunk. There are still great numbers 

 of larvae on the trees, some of them still in second stage. Placed a considerable number 

 of larvae in separate vivarium. 



June 12, '92. — Most all \2lx\x, in vivaria have changed to pupa;. 



June 16, '92. — There are still a considerable number of larvK on the trees. All are 

 about full-grown. No beetles so far. Plenty of pup« around base of trees. 



