I have found in various collecitons in Europe, both public and private, specimens of the moth of our Cotton Worm determined after Hübner as above. From a note from Dr. Staudinger, I gather that in his collectin the moth is so determined and as proposed by me. Were I now to propose to call this species by its synonym, Noctua xylina Say, I do not think any of the entomologists in Europe would agree thereto, or be governed by Dr. Hagen's reasons for the change.