THE CANADIAN ENTOMOLOGIST. l65 



The pupa, after hardening, when held at arms length, appeared flesh 

 colored, but on closer examination this tint was confined to the more ex- 

 posed parts, and it was then seen to be of a beautiful clear green ; yet they 

 were not all alike in color, some being darker, some lighter than others, 

 while several had a sort of bloom on them, as if dusted with flour, which 

 gave them a whitish appearance, but all united in having six golden spots 

 on their upper surface. Fully forty-eight hours before giving imago the 

 colors of the future butterfly could be distinctly seen through the thin 

 shell. 



On June 20th, at 7 a. m., the first chrysalis gave a male imago, half an 

 hour later another male followed, and by 7 p. m. nine had emerged, but of 

 these only one proved to be a female. It was not till the butterfly appeared 

 that I obtained positive knowledge of the species of insect I had been so 

 fortunate as to rear, and then regretted the opportunity I had lost in tak- 

 ing full notes. I immediately sent one to Mr. W. H. Edwards in hopes 

 it might reach him in the chrysalis state, and selected for this purpose the 

 one last formed, but a postal from that gentleman a few days later in- 

 formed me the imago had emerged while en route. 



The following morning, June 21, two more had made their appearance, 

 both females, and by 8 p. m. the remaining three, one of these proving a 

 female, so that out of the fifteen I began with all were carried to the im- 

 ago state without the loss of a specimen, except, perhaps, the one sent 

 Mr. Edwards, which would doubtless have been perfect had it reached 

 him in time. 



I wish to call attention to the few females in comparison with the 

 number of males (as I do not know the sex of the one sent Mr. Edwards 

 that can be left out of the calculation), thus we have ten males and four 

 females. That this proportion would hold good in a large number re- 

 mains to be proven, but the uncommonness of the butterfly, as a rule, 

 and the fact that none of mine were attacked by parasites, has led me to 

 believe that it does, and possibly this may account for the scarcity of this 

 fine insect. Also note that the males were the first to emerge. 



The females can be distinguished at a glance, having the dark portion 

 on the underside much lighter than in the male. 



In conclusion : — It seems safe to say that the eggs are laid in small 

 clusters in the latter half of April or first of May, and that search should 

 be made for them at this time on the outermost leaves of the white birch, 

 which is one, if not its only, food plant ; that the larval state continues for 

 at least three weeks, while that of the chrysalis about ten days. 



