In referring to the species described by Dr. Felder, I have quoted from papers which he has sent me, with distinct titles and separate paging, but which were all first published in the ‘Wiener Entomologischen Monatschrift,’ viz. “Lepidopterologische Fragmente” (quoted as “Lep. Fragm.”), published at intervals from June 1859 to August 1860, “Lepidoptera Nova Malayica” (quoted as “Lep. Nov. Mal.”), published in 1860, and “Lepidoptera Nova a Dr. Carolo Semper in insulis Philippinis collecta” (quoted as “Lep. Nov. Philipp.”), published in 1861. It is to be regretted that the titles and paging of these separate papers were not made to correspond with the original publication, so as to have made a more exact reference possible. I have also quoted Zinken’s ‘Beitrag zur Insecten-Fauna von Java’ separated from the ‘Nova Acta Acad. Nat. Curios.’; but in this case the pages and the numbering of the plates have been preserved as in the original work. EXPLANATION OF THE PLATES. PLATE I. Represents the various forms of _Papilio Memnon_ (see pages 6 and 46). N.B. The left side of each figure shows the upper surface, and the right side the under surface of the same insect. Fig. 1. A male, from Borneo (a slight local variety). Fig. 2. A female, from Java (a variety like _P. Agenor_, Cr.). Fig. 3. A female, from Sumatra (a variety near _P. Anceus_, Cr.). The last two are varieties of the 1st dimorphic form of female in this species. Fig. 4. A female, from Java (_P. Achates_, Cr.). The 2nd dimorphic form of female of _Papilio Memnon_. PLATE II. Represents the various forms of _Papilio Pammon_ (figs. 1, 3, 5, and 6) and _P. Theseus_ (figs. 2, 4, and 7). (See pages 6, 7, 51, 52, and 53.) N.B. The left side of each figure shows the upper surface, and the right side the under surface of the same insect. Fig. 1. _Papilio Pammon_; a male, from Malacca. Fig. 3. The first form of female, closely resembling the male, from India. Fig. 5. The second form of female (_P. Polytes_, L.), from Singapore. This is the most common and widely distributed form of female, occurring everywhere with the male. Fig. 6. The third form of female (_P. Romulus_, Cr.), from India. Fig. 2. _Papilio Theseus_, the first form of female, almost exactly resembling the male, from Timor. This form is very rare. Fig. 4. The second form of female, from Timor. Fig. 7. The third form of female (_P. Theseus_, Cr.), from Sumatra. The second and third forms of female seem about equally plentiful, but are generally confined to separate islands. A fourth form of female (_P. Melanides_, De Haan) would have been figured, but could not be brought on to the plate. (See pages 7 and 53.) PLATE III.