THE CANADIAN ENTOMOLOGIST. 



the first chrysalis suspended on 20th, its butterfly emerging 29th July. So 

 that the periods were, egg 6, larva 17, chrysalis 9 days. Five per cent, of this 

 brood became lethargic after second moult. This, then, was the second 

 generation of the butterfly of the season, from the first laying of eggs. All 

 the emerging butterflies were tharos, no marcia, and all were characterized 

 by an intense blackness of the dark portions of the wings, as compared 

 with any Coalburgh examples. Also nearly all the females showed the discal 

 band on fore wings above yellow, instead of fulvous. (This last peculiarity, 

 the change in the band^ appeared in some of the females of the third Coal- 

 burgh generation, but no other.) On the under side the reticulated lines 

 were unusually heavy, and the marginal cloud and the brown patches 

 largely extended and deep colored. 



This second generation was just one month behind the second at 

 Coalburgh. So far only could I trace the Catskill generation this year ; 

 but, as in 1875, Mr. Mead obtained eggs on the 27th July and following 

 days, the larvae from which all hybernated, that would be the second 

 laying of eggs of the season, and the resulting butterflies the first genera- 

 tion of the following year. 



So that, in the Catskills, the species is digoneutic, there being two 

 generations annually, the first of which is mania, or the winter form, and 

 the other is the summer form, and a certain proportion of thQ larvae 

 proceeding from the first hybernate (so far as appears) and all those from 

 the second. 



At Coalburgh there are four generations, the first of which is mania 

 and the second and third are tharos, and none of the larvae from these 

 have so far been found to hybernate ; and the fourth, under exceptional 

 circumstances, has produced some tharos and more juarcia the same 

 season, a large proportion of the larvae also hybernating. But had the 

 larvae of this brood remained at Coalburgh, where the temperature for 

 several weeks after they left the egg remained high, the resulting butterflies 

 would have been tharos, and the larvae from their eggs would have 

 hybernated. And here I may say that, in addition to the broods spoken 

 of, I also raised others at Coalburgh out of the line of regular succession, 

 as midv/ay between the second and third generations, for example, and 

 none of these larvae became lethargic, and the resulting butterflies were 

 all tharos. 



The altitude of the Catskill region in which I was is from 1650 to 

 2000 feet above tide water, and the highest peaks of the range were 



