THE CANADIAN ENTOMOLOGIST, 73 



this region. In the case of intorogationis, when compared with the species 

 northward, it is the second and third broods which are interpolated in this 

 region, and when compared with comma of this region, it is the third brood 

 of interrogation is which is interpolated. To the southward the fourth 

 brood would have ample time to reach the imago before winter set in, and 

 the species should be as abundant, where the food plants are found, as 

 comma is here. 



I say nothing of i?iterrogationis in the Northern States, because I find 

 nothing immediately bearing on the periods of the broods in my note 

 books, and by correspondence I have failed to obtain special information. 

 I simply know from experience that in the Catskills there are two annual 

 broods, but whether the hybernating individuals are altogether Fabricii, or 

 whether the brood which proceeds from these is wholly umbrosa, I do not 

 know and cannot learn. I think Fabricii will be found to be the winter 

 species there, and umbrosa the summer, but this is conjecture. I hope 

 some lepidopterist at the north will examine this matter and report. 



I give a statement of results obtained : 



FIRST BROOD : Eggs laid by Fabricii. 



1877 — 28th April, obtained eggs from ^ Fabricii in confinement. 



Result about 4th June — 21 umbrosa. 

 I had watched for years for a % Fabricii, but this was the only one I 

 was ever able to take. 



SECOND BROOD : 



1 87 1 — 4th June, eggs laid by umbrosa in confinement. Result about 



1 st July — 11 umbrosa, 6 Fabricii. 

 1869 — 5th June, found larvae. Result about 25th June — 26 umbrosa, 



no Fabricii. 

 1S73 — June, found larvae. Result last of June — 19 umbrosa, no 



Fabricii. 

 1870 — 4th July, found eggs. Result 10th August — 1 umbrosa, 2 



Fabricii. 



THIRD BROOD : 



!87i — 1st August, confined 11 umbrosa and obtained multitudes 



of eggs. Result 1st September — 63 umbrosa, 34 



Fabricii. 



