I'liE CANADIAN ENTOMOLOGIST. 283 



rule, and produces at least a third and probably will produce a fourth 

 generation, by exception. 



During the first week of May of the present year the beetles were 

 abundant, and by the 6th of May the first eggs were found. By the 20th 

 of the same month the eggs were hatching, and by June 8th the first pupa? 

 were obtained. By June 12th the bulk of the larvae had transformed to 

 the pupa state, and by June i8th, in the vivarium, the second generation 

 of beetles (or first bred of the season) began to appear, and were in great 

 numbers by the 20th of the same month. Before the end of the month of 

 June most of the second brood of beetles had issued and eggs from this 

 second brood were obtained in numbers and were numerous out of doors 

 wherever the leaves had not been already ruined. Yet up to this time 

 belated larvae of the first generation were yet to be found. By the 15th 

 of July the second generation of beetles began to get scarce and to perish 

 in the vivarium. By the 18th of July the first pupge of the second genera- 

 tion were observed, and the bulk of the larvae were descending the trees. 

 Nevertheless, at the same time and up to the 26th of July, there were 

 eggs and larvae of all sizes yet to be found of this second generation. 

 During the last days of the month, these larvje of all sizes were everywhere 

 crawling about, having defoliated the trees. The third generation of the 

 beetles in the vivarium began to appear on the 27 th of July, exactly 27 

 days from the egg, and during the first ten days of August the eggs were 

 obtained in the vivarium from this third generation of beetles. To sum 

 up, the larval period of the first generation lasted from the third week in 

 May to the end of June, the bulk transforming to the pupa state 

 about the middle of June, the hibernated imagos being scarce or absolutely 

 unseen during the month of June. The beetles of the second generation 

 began to appear about the middle of June and were in force during the 

 third week of that month, while yet a few larvse of the first generation 

 were to be found. By the end of June most of the second generation of 

 beetles had issued, and the eggs of these were numerous where the leaves 

 had not been previously destroyed. By the middle of July the imagos of 

 the second generation became scarce, and durina the third week of the 

 month the bulk of the larvge of the second generation were descending the 

 trees. Some pupse were formed, and a (ew of the eggs and larvae of all 

 stages were yet to be seen. By the last of July the third generation of 

 beetles began to appear, and continued to issue during early August. I'he 

 eggs of this third generation are laid only on fresh leaves, 



