“The neuration of the fore wing does not seem to me to accord sufficiently with that of any known genus of Oreades to admit of its being classed with them. It undoubtedly has close affinities with the characters of the genus Debis (= Lethe Hübn.) as laid down by Westwood and Hewitson, if we exclude therefrom, as we should, the _Papilio Portlandia_ of Fabricius. It is not a little interesting to notice that these authors have arranged this group in immediate proximity to the genus Cyllo (= Melanitis Fabr.), in which Dr. Boisduval placed the fossil species from Aix, named by him sepulta. Nor is it less interesting to find that in both genera all the living representatives (even including those discovered since the publication of the ‘Genera of Diurnal Lepidoptera’) are natives of the East Indies; so that the fossil butterflies of Provence have their nearest living allies in the far East.” Although differing from Neorina (Pl. II, fig. 8) very strikingly in the form of the wing and the swollen base of the costal nervure, this genus has some striking points of agreement with that in the neuration of the fore wing. The nervure closing the cell indeed is straight in Lethites and strongly curved in Neorina, but, as there, two of the superior subcostal nervules arise before the tip of the cell, and the other two are thrown off at about equal distances between the apex of the cell and of the wing; the vein closing the cell meets the median nervure in both cases as far beyond its second divarication as that is beyond the first; the shape and proportionate length of the cell is nearly the same in the two, but the costal nervure appears to be much shorter in Lethites.