In the Proceedings of the American Philosophical Society for 1874 is published a list of certain family groups of Bombycine moths, and I retained there the terem Platypterices, of Hubner, 1806, for the group to which now a distinct family value is given, and which should therefore bear the name Playpterygidœ. Already in 1868, Trans. Am. Ent. Soc., I had proposed the subfamily terminaton to the correctd original term of Stephens: Platyptericidœ.