In September, 1873, Mr. T. L. Mead, who was then at Coalburgh, observed a ♀ pseudargiolus depositing eggs upon the flowers of Actinomeris squarrosa, and on examining the flower heads found a number of eggs. He brought home two of the females, and enclosed them in a muslin bag upon the flower heads of the same plant, near my house, the plant being not at all an uncommon one here. Several eggs were soon deposited, and in due time the larvae were hatched and some of them were carried through to chrysalids, a change which occurred about the middle of October.