In design (Pl. III, fig. 3) Thaites recalls none of the recent genera very closely. In the fore wings it approaches Thais (Pl. III, fig. 4) rather than the others, and in the hind wings some species of Parnassius (Pl. III, fig. 5). It has none of the eccentric spots of Parnassius and a darker ground than any of the modern types. It is wholly unprovided with the strongly marked crescentic spots of Thais, but in the position, form and arrangement of the principal markings rather recalls Archon. Excepting Eurycus and some species of Thais, no modern genera resemble Thaites in the extension of a distinctive pattern upon the hind wings to or nearly to the extremity of the cell. Whether any of the markings were accompanied by the brilliant spots often seen in Thais, Archon and Parnassius cannot be determined, but we may presume that they were not, since in these genera the markings are dark upon a lighter ground, while in Thaites they are light upon a dark ground,—a combination found among the Papilonid genera, only in some of the swallow tails. In the markings of the abdomen, I do not know that we find anything parallel to Thaites among the Parnassians, but among the neighboring Equites there are similar examples of rows of small light spots on a dark ground. I have not been able, however, to examine this point carefully. THAITES RUMINIANA HEER MS. Plate III, figs. 1, 3, 6-10. _Thaites Ruminiana_ HEER, Climat pays tert., trad. Gaudin, 205 (1861) [absq. descr.]; Sap., Ann. Sc. Nat. [5], Bot., xv, 343 (1872) [ibid.].