THE CANADIAN ENTOMOLOGIST. 247 



Dr. Lintner expressed surprise that the beetles should go into winter 

 quarters in midsummer, and yet more that they should feed for so long a 

 time previously. To settle the matter, if possible, I repeated my obser- 

 vations during the present season, while Dr. Riley carried on a series of 

 observations at Washington, D. C. Dr. Riley, in Science No. 492 for 

 July 8, 1892, records the facts that he then had imagos of a summer 

 brood, and that these imagos had oviposited June 28. In a letter dated 

 July 27, he informed me that the larvae from these eggs had pupated. 

 It is thus positively settled, that at Washington, D. C, there are two 

 broods at least of this insect. My observations at New Brunswick gave 

 an opposite result. 



The season was rather later than that of 1889, and I saw no trace of 

 beetles until May 17, and no beetles until May 19. The elms were at 

 this time in full leaf, and began to show the characteristic little holes eaten 

 by the insects. Eggs were first observed May 29, on a small tree, every 

 part of which I could readily scan, and I selected this tree, which was a 

 prime favourite with the insects, for special observation, while I also 

 examined daily the trees in front of the Experiment Station building, the 

 lower branches of which were within easy reach. Dissections made at 

 this time showed that the ovaries of all the females were fully distended, 

 each containing a considerable number of mature eggs, so many, indeed, 

 that it was impossible to get out an ovary entire. The males, when 

 examined, showed rigid, fully-developed testes, which were easily found 

 and removed. The first batch of eggs gave larvae June 6, and oviposi- 

 tion continued to June 20th, or perhaps a little later. The hibernating 

 beetles gradually lessened in number, and had disappeared entirely June 

 30. On June 29, I found the first pupa, and on that day collected all the 

 unhatched egg clusters I could find — a very few only. One of these 

 clusters gave larvae July i, and all the others failed to hatch. During the 

 first days of July, I gathered about 200 pupte or larvge ready for pupation, 

 and beetles began appearing July 8 in the open air, as well as in my jars. 

 There were then on the trees at this date larvae of all sizes, pupae and 

 beetles of the summer brood, but no egg masses. The beetles in my 

 breeding jars were fed until August i, at which date all refused to feed 

 further. I had noticed, a it"^ days previously an indisposition to feed 

 among some of the older beetles, and had noted, too, an unusual accum- 

 ulation of excrement at the bottom of the jar. I found, later, that the 

 last thing done by the beetles before retiring to winter quarters is to 



