All that can be said, therefore, must be drawn from the illustrations and remarks of Professor Heer. These seem to me to leave no doubt that the insect must be placed in Eugonia, and that it was a little larger than the European vau-album or our own j-album. A comparison of the neuration of _Eugonia j-album_ (Pl. I, fig. 4) with that of Heer’s figures of the fossil (reproduced on Pl. I, figs. 1, 7) shows that the last divarication of the subcostal nervure of the fore wing, and the points of termination of the last two superior nervules and of the subcostal nervure itself are essentially the same in both; while the position of all the markings on the fossil, allowing for its natural defects, are quite the same in position, direction and intensity, as in _E. j-album_ (Pl. I, fig. 6). The same may be said of the form of the wing, as far as it can be seen, but as this is true only of the costal margin, and the merest fragment of the outer border, it cannot be considered to have much weight in itself; still, taken in connection with all the other features, which agree almost wholly with those of Eugonia, and but partially with its near ally Vanessa, to which Heer compares it, we must refer the fossil to Eugonia, at least until a new examination of the fossil shall give us further facts as a basis for an opinion. This is the position dubiously assigned to it by Kirby, in his Synonymic Catalogue. Tertiaries of Radoboj, Croatia. PAPILIONIDÆ—DANAI—FUGACIA. MYLOTHRITES SCUDDER. Of the form of the fore wing (Pl. II, figs. 7, 17) we can say but little, from the imperfect nature of the fossil; the costal margin, however, is very regularly and rather strongly arched, and the direction of the middle portion of the outer border (probably at a right angle, or at a little less than a right angle, with the apical portion of the costal margin, and but slightly convex) leads us to presume that the apex was rather pointed, though not falciform. The neuration of the same wing (Pl. II, fig. 7) is very similar to that of Mylothris.[V] The costal nervure terminates at about five-sevenths the distance from the base of the costal margin to its tip; the subcostal nervure emits two branches before the cell, the second probably close to the apex of the cell, the limits of which are not given in the drawing prepared for me, but which could probably be made out by a sufficiently careful examination of the original; a third superior nervule is emitted from the subcostal nervure at less than half the distance from the origin of the second to the outer border, and the emission of the inferior nervule, if it could be traced, would mark the termination of the cell; the median nervure is of course three-branched and scarcely curves upward at all to meet the subcostal. The design of the upper surface of the fore wing (Pl. II, fig. 17) is simple, consisting only of a broad marginal pale band on a dark ground, enclosing small dark spots in the middle of the interspaces.