I herewith send you some memoranda of what I have done during the past summer, largely owing to the assistance of Mr. Mead. I consider it my most successful season in the way of obtaining larvæ eggs. One of the most interesting species we discovercd was Lycaena pseudargiolus. Mr. Mead noticed a female hovering about flowers of Actinomeris squarrosa, which is a weed found hereabouts in company with A. heliianthoides–the last being a thousand-fold most numerous-andl suspeceing that she was oviposing, he made a careful examination of the plant.