Local form _a_.—_Male_: border of posterior wings beneath narrow and of an ashy-blue colour. _Female_: near _P. Anceus_, Cr., and _P. Laomedon_, Cr., but of an olive-ashy colour. _Hab._ Borneo (_Wall._). Local form _b_.—_Male_: band on under side of posterior wings ashy; the spots large, with reddish-orange lunules between the two series, and below the four outer ones. _Hab._ Lombock (_Wall._). _Remarks._—The difference between the male and the 2nd form of female is so great, both in form and colouring, that they could not have been imagined to be the same, had they not been bred from the same larvæ. They have also been taken “_in copulâ_” by myself. Each form varies considerably, both individually and locally; yet there are none intermediate between the two. I consider them, therefore, as presenting a fine instance of dimorphism; and I also believe that the second form mimics _P. Coon_, for reasons which I have explained at p. 21. 44. PAPILIO ANDROGEUS, Cramer. ♂, _P. Androgeus_, Cr. Pap. Ex. t. 91. f. A, B. ♀, 1st dimorphic form, _P. Agenor_, L., Cr. Pap. Ex. t. 32. f. A, B. ♀, 2nd dimorphic form, _P. Achates_, Cr. Pap. Ex. t. 182. f. A, B; _P. Alcanor_, Cr. Pap. Ex. t. 166, f. A. _Hab._ Malacca (_Wall._), India. _Remarks._—Ever since it was discovered that the insects figured by the old authors as _P. Anceus_, _P. Agenor_, _P. Achates_, &c. were varying females of _P. Memnon_ and _P. Androgeus_, the whole of these were very naturally concluded to belong to one varying species. An examination of many extensive collections, however, has convinced me that the continental forms, on the one hand, and the insular ones, on the other, can be readily distinguished, and really form two very well-marked species. The red lunules at the anal region beneath characterize all specimens from India (_Androgeus_, Cr.), while these are entirely absent in all the insular specimens (_Memnon_, Cr.); and the same characteristic difference can be traced in a greater or less degree throughout all the infinitely varying female specimens. My specimen from Malacca has a faint trace only on the upper surface of the characteristic red mark at the base of the anterior wings; in other respects it resembles the continental individuals. This form mimics the Indian form of _P. Coon_ (_P. Doubledayi_, Wall.). 45. PAPILIO LAMPSACUS, Boisduval. _P. Lampsacus_, Bd. Sp. Gén. Lép. p. 190; De Haan, Verh. Nat. Gesch. p. 23, t. 2. f. 2. _Hab._ Java (♂) (_Wall._). 46. PAPILIO PRIAPUS, Boisduval. _P. Priapus_, Bd. Sp. Gén. Lép. p. 190; De Haan, Verh. Nat. Gesch. p. 23, t. 2. f. 1. _Hab._ Java (_Boisd._), Sumatra (_Raffles_), Borneo (_De Haan_). 47. PAPILIO EMALTHION, Hübner. ♂, _Iliades Emalthion_, Hübn. Samml. Exot. ii. t. 117; _P. Emalthion_, Boisd. Sp. Gén. Lép. p. 196; _P. Floridor_, Godt. Enc. Méthod. ix. p. 809; _P. Kruscusterina_ in Eschsch. Voy. Kotzebue, t. 3. f. 5.