Ornithoptera Pronomus, _G. R. Gray_, = O. Poseidon, _Db._ (var.), p. 36. Ornithoptera Archideus, _G. R. Gray_, = O. Poseidon, _Db._ (var.), p. 36. Ornithoptera Euphorion, _G. R. Gray_, = O. Poseidon, _Db._ (♀ var.), p. 36. Ornithoptera Amphimedon, _Cr._, = O. Helena, _L._ ♀, p. 38. Papilio Hegemon, _G. R. Gray_, = P. Polyphontes, _Bd._, p. 43. Papilio Melanides, _De Haan_, = P. Theseus, _Fab._ (♀ form), p. 53. Papilio Romulus, _Cr._, = P. Pammon, _L._ (♀ form), p. 52. Papilio Rumanzovia, _Eschsch._, = P. Emalthion, _Hübn._ (♀ form), p. 48. Papilio Polytes, _L._, = P. Pammon, _L._, ♀, p. 51. Papilio Orophanes, _Bd._, = P. Ambrax, _Bd._, ♀, p. 54. Papilio Elyros, _G. R. Gray_, = P. Alphenor, _Cr._ (♀ form), p. 53. Papilio Amanga, _Bd._, = P. Ormenus, _Guér._ (♀ form), p. 55. Papilio Onesimus, _Hewits._, = P. Ormenus, _Guér._ (♀ form), p. 55. Papilio Drusius, _Cr._, = P. Gambrisius, _Cr._, ♀, p. 58. As the arrangement of the species of _Papilio_ which I have adopted in this paper is somewhat new, and I hope will be found to be more natural than those which have been previously used, I here add lists of the Indian and Australian species arranged in the same manner. Those already included in my Malayan list will be indicated thus, (Mal.), and printed in _italics_. _List of the_ PAPILIONIDÆ _of the Indian Region_. 1. Teinopalpus imperialis, _Hope_. 2. Ornithoptera Darsius, _G. R. G._ (Ceylon). 3. —— Rhadamanthus, _Bd._ 4. —— _Pompeus_, Cr. (Mal.). 5. —— _Amphrisius_, Cr. (Mal.). _Papilio_ (Sect. A). _Nox group._ 6. Papilio _Varuna_, White (Mal.). 7. —— Aidoneus, _Db._ 8. —— Philoxenus, _G. R. G._ 9. —— Polyceutes, _Db._ 10. —— Dasarada, _Moore_. 11. —— Ravana, _Moore_. 12. —— Minereus, _G. R. G._ 13. —— Icarius, _Westw._ 14. —— Bootes, _Westw._ 15. —— Janaka, _Moore_. _Coon group._ 16. Papilio Doubledayi, _Wall._ _Polydorus group._ 17. Papilio Jophon, _G. R. G._ (Ceylon). 18. —— _Diphilus_, Esp. (Mal.). 19. —— Alcinous, _Klug._ 20. —— Mencius, _Feld._ 21. —— Hector, _L._ _Papilio_ (Sect. B). _Protenor group._ 22. Papilio Protenor, _Cr._ 23. Papilio Elphenor, _Db._ 24. —— Rhetenor, _Westw._ 25. —— Sakontala, _Hewits._ _Peranthus group._ 26. Papilio Crino, _Fab._ (Ceylon). 27. —— Bianor, _Cr._ 28. —— Polyctor, _Bd._ 29. —— Ganesa, _Db._ 30. —— Arcturus, _Westw._ 31. —— Paris, _L._ 32. —— Palinurus, _Fab._? 33. —— Krishna, _Moore_. _Memnon group._ 34. Papilio _Androgeus_, Cr. (Mal.). 35. —— Polymnestor, _Cr._ (Ceylon). 36. —— Demetrius, _Cr._ _Helenus group._