About fifteen years ago I obtained from Dr. O. Staudinger a series of all the species placed under the Choreutidæ in his Catalogue of the Lepidoptera of the European Fauna (1871), and made a critical study of their structure to aid in the arrangement of our North American species. This study also led me to look up the nomenclature of these insects, and the results are given in this paper.

There has been a growing tendency for some time to use the generic names proposed by Hübner, and while at first I was not inclined to adopt the genera in his Tentamen, I now feel compelled to do so. It is not necessary to argue this question, since both sides were so ably presented years ago in this journal.