70 THE CANADIAN ENTOMOLOGIST. 



The second laying of eggs occurs in July, between 15th and 30th, and 

 the butterflies from these appear last of Aug. or first of Sept. 



And the third laying occurs in September, the butterflies therefrom 

 emerging in October. The several broads are accelerated or retarded in 

 their periods by the weather, great heat quickening every one of the pre- 

 paratory stages. 



So far as I know from breeding, or from very extended observations in 

 the field, the last laying of eggs produces Harrisii only, and the series 

 therefore begins in the spring with eggs laid by that form. 



The result of the eggs laid by Harrisii has in all cases been dryas 

 only, with a single exception, when one Harrisii $ emerged. 



The next brood of the season, the eggs having been laid by dryas, has 

 sometimes consisted wholly of dryas, but again, as in the instance recorded 

 in the Ent., and first above mentioned, of both forms, Harrisii con- 

 siderably outnumbering dryas. 



The third brood, from eggs laid by dryas, has resulted in Harrisii 

 wholly, and closed the season. 



Harrisii is the winter form of the species, and dryas the summer. The 

 first brood of the summer is dryas, and were the season here as short as 

 it is in the Catskill Mountains of New York, these two broods would 

 comprise the whole round. In the Catskills the first eggs are laid in 

 June, a full month after the first are laid in Virginia, and the butterflies 

 emerge in July, all dryas, and eggs laid by these produce Harrisii in 

 August, and this form hybernates. So that the two northern broods cor- 

 respond with the first and third southern broods, and the second brood at 

 the south is the interpolated one, and consists of both forms of the 

 species. In some years comma is excessively common here in October 

 and November, and in no season is it rare. I give a statement of results 

 obtained : 



FIRST BROOD : Eggs laid by HARRISII. 



187 1 — Between 10th and 18th May, found larvae. Result from 20th 



May to 2nd June — 7 dryas. 



1873 — 20th May, found larva;. Result about* 12th June — 4 dryas. 



* I. e., a few days before and after the date named. 



