In my examination of the types indicated by Mr. Scudder I have been quite unable to separate Acidalia niphe, Scudd., Gen. 101, from the type of Argynnis. This latter type, A. aglaia, L., is characterized by the second radial branch of primaries running so close to the main vein, for a distance beyond the median cell, as to form a minute false accessory cell above the angle of the radius which the crossvein joins. Since this, as well as all other features, are repeated in the wing of niphe, I conclude the genus Acidalia of Hübner, as founded on this species, must be dropped. Another type, Dryas paphia, can hardly be retained as distinct from Argynnis from the neuration. The only difference is, that the second radial branch, in running propinquitous, leaves the main vein at somewhat before the point chosen in aglaia and niphe. Indubitably paphia is a species belonging to the same phylogenetic group, a trifle isolated. On the other hand, neither Issoria lathonia nor Brenthis hecate share the character of the appressed second radial branch of Argynnis and should be separated from this genus. The differences in the neuration between Issoria and Brenthis are very small and comparative; in both the second radial branch is not appressed and leaves the main vein above the median cell before the point of juncture of the crossvein. The point of departure in Issoria is a little outwardly removed and the propinquity is so great that one can see that it requires but little to make the branch decumbent. Issoria differs further by the angulate papery wings and by the fact that the crossvein on hind wings is but a faint scar between second median branch and cubitus.