From time to time for the past ten years I have been in the habit of receiving, from various collectors in this country and Europe, speciments of North American Hesperidœ for comparison and identification with my large collection, which has been justly famous for its completeness. As this collection is now no longer in my possession, being now the property of my friend C. B. Aaron, of Philadelphis, and as I have transferred my allegiance from entomology to ethnology it has occurred to me that it will be well fro me to give here to the students of the Hesperidœ the benefit of such tables, nots teh compilations as have, in years past, been of value to me in the identification of the species in this difficult family.