The present is the first of a series of papers on the Tortricidæ of North America which the writer hopes to be able to prepare from the material now in hand, and collections that may be made hereafter by Entomologists in various parts of the country.

I was first led to the study of the Tortricidæ by the advice of Mr. A.R. Grote, who, with a generosity rarely met, placed his entire collection of Tortricids in my hands to work up, and further gave me his collection of European Tortricidæ for comparison, and loaned me his types for study. I fear I may never be able to make anything like an adequate return to this gentleman who has placed me under so great obligations.