120 THE CANADIAN ENTOMOLOGIST. 



passed third moult. On the 25th these two passed fourth moult, and were 

 one inch long. They continued to grow till the 29th, when they measured 

 1.8 inch,and in the morning had fixed for chrysalis. Made chrysalis in the 

 afternoon of same day. and the butterflies emerged on 9th June. Time 

 from hatching to chrysalis 12 days. A female, which I confined on milk- 

 weed, laid eggs on 24th May, which hatched on 30th, by which the 

 duration of the egg stage would be 6 days, of the chrysalis n days, 

 deposition of the egg to the butterfly 29 days. This is surprisingly 

 rapid. The larvae which delayed a little the third moult passed the same 

 shortly after, and became butterflies within from one to three days after 

 the first two mentioned. There has been some uncertainty as to the 

 number of moults of this species, some authors giving three only. I have 

 had for two years a series of drawings made by Miss Peart, in 1873, 

 representing all these stages, as followed out by herself, near Philadel- 

 phia, and she found and figured the four moults. In this region there are 

 at least two broods annually, the later one appearing about the 1st of 

 October, and the butterflies hybernate. 



CORRESPONDENCE. 

 Dear Sir, — 



In a recent number of the C. E., my friend, W. V. Andrews, desired 

 to know if any of the readers of the Ent. had taken brown larvae of 

 Ceratomia quadricoriiis. Three years ago they were common here on the 

 English elms, and a large proportion of them were brown ; indeed, the 

 green ones were the exception. Robert Bunker, Rochester, N. Y. 



Dear Sir, — 



I recently had the pleasure of receiving a female Smerinthus cerisii 

 Kirby, which I believe is the only known example of that sex. This 

 interesting specimen was captured in Maine. Yours truly, 



Geo. W. Peck, New York. 



