We have here before us a paper by an accomplished scholar, on a Subject dear to us from our own studies. Mr. Scudder's Revision presents two main points for our consideration. The first pont affects the sequence of the Butterflies in a systematic arrangement ; the second the application; of the scientific law of priority.. As to the first, the consideration which have influenced Mr. Scudder to side rather with Oschsenheimer than with Boisduval, where the present Revision is not original, are evidently not lightly taken.