_P. Rama_, Feld. Lep. Nov. Mal. p. 1. _P. Arycles_, Boisd. Sp. Gén. Lép. p. 231? _Hab._ Malacca, Sumatra (_Wall._). _Remarks._—I have little doubt but this is the _P. Arycles_ of Boisduval. His description, however, does not mention the distinctive character of the four large spots only in the discoidal cell; I have therefore used Dr. Felder’s name. LEPTOCIRCUS, Swainson. This small but interesting genus differs somewhat from _Papilio_ in the neuration of the wings, but is best distinguished by the longitudinal fold and great elongation of the hind wings. The species frequent water, often settling on the edges of rills, or hovering over pools and rivulets in the sunshine. The few species known are all very closely allied, and might with equal propriety have been considered as local forms of one species. Three have been already described, and I have therefore thought it better to add one more, than to attempt to reduce those which have been generally accepted as species to a lower rank. 120. LEPTOCIRCUS MEGES, Zinken. _P. Meges_, Zink. Beitr. Ins. Java, p. 161, tab. 15. f. 8. _Leptocircus Curius_, Sw. Zool. Ill. pl. 106; Boisd. Sp. Gén. pl. 7. f. 1, pl. 17. f. 3, p. 381. _Hab._ Java, Malacca (_Wall._). 121. LEPTOCIRCUS CURTIUS, n. s. Larger than _L. Meges_; outer black margin broader, and apical nervures thicker; bluish band much narrower, of equal width on both wings, straight, abruptly narrow where it crosses the discoidal cell of the fore wings, and rounded at the inner margin so as to form a small notch at the junction of the fore and hind wings. Under side with the band bluish silvery; the three small bands on the anal margin differing from those on _L. Curius_ and _L. Meges_, the first being transverse, and not produced obliquely to join the vertical band, the second small and nearly obsolete, the third at the anal angle transverse, very little curved, and sharply defined. Body beneath and base of all the wings greenish ashy. Expanse of wings 1⁹⁄₁₀–2 inches. Length, head to tip of tail 2⁶⁄₁₀ inches. _Hab._ Celebes (_Wall._). 122. LEPTOCIRCUS DECIUS, Felder. _L. Decius_, Feld. Lep. Nov. Philipp. p. 13. _L. Corion_, G. R. Gray, List of Pap. in Brit. Mus. _Hab._ Philippine Islands. 123. LEPTOCIRCUS CURIUS, Fabricius. _L. Curius_, Fab. Ent. Syst. iii. 1. p. 28; Doubleday, Zoologist, 1843, p. 111; Gen. of Diurnal Lep. pl. 4*. f. 1; Don. Ins. Ind. pl. 47. f. 1. _Hab._ Java (_Wall._), North India. NOTE.