In the course of my work on North American Eupithecias a number of species have gradually accumulated which I had, from time, to time, tentatively set aside as probably new but which I did not venture to describe as such until I had secured a better working knowledge of the species already named. Rightly or wrongly I believe I have now attained this desirable position and in consequence offer herewith h descriptions of certain new species together with genitalic figures of both sexes, as far as material is available.