In the early part of May, 1876, I secured a newly-developed female moth of the above species to a branch of the common red currant (Ribes rubrum). It was about seven o'clock in the evening of May 6th, to be more precise in regard to time. On the next morning, I visited the spot, and a lusty male was discovered in coition. This condition of things continued until the close of the day, when her amorous partner, lured by the presence of dusky night and midnight revels, gradually loosened his embrace, and hied him away to other scenes.