In looking over my collection, preparatory to a rearrangement of them forms, I find several new species, that I desscribe below. One of them represents an interesting new genus, allied to Nemoura. I have added illustrations of the gential structures, as these are of considerable value in the determination of the species. I hope soon to be able to prepare a revision of our species of this family, one of teh most primitive of existing winged insects.