Writing of this species in his magnificent work on the Butterflies of New England, Dr. Scudder said:

“ This butterfly is double brooded throughout the whole of its range, the first generation making its advent during the last week in May, the females emerging the first week in June, when the males are common. *** The second brood varies considerably in the time of its apparition. Mr. Saunders reports that the first butterflies appeared one year in London, August 2nd; while Mr. Lintner took the first at Albany on July 15th another year found them beginning to fly by the 7th, and one year even found them ‘very abundant’ on the 9th.***