OF THE MALAYAN REGION. 47 



$, 2ncl dimorphic form, P. Achates, Cr. Pap. Ex. t. 243. A. 

 Hab. Java, Sumatra [Wall.]. 



Local form a. — Male : border of posterior wings beneath narrow and of an ashy-blue 

 colour. 



Female : near P. Ancetts, Cr., and P. Laomedon, Cr., but of an olive-ashy colour. 

 Hab. Borneo {Wall). 



Local form b. — Hale : band on imder 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.). 



Bemarks. — 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 larvse. They have also been taken "in copula" by 

 myself. Each form varies considerably, both indi-vddually 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 Andbogeus, Cramer. 



d, P. Androgens, Cr. Pap. Ex. t. 91. f. A, B. 



5, 1st dimorphic form, P. Agcnor, 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. 



Memarks. — Ever since it was discovered that the insects figured by the old authors as 

 P. Anceus, F.Agenor, F. Achates, &c. were varying females of P. Memnon and P. Andro- 

 gens, the whole of these were very naturally concluded to belong to one varying species. 

 An examination of many extensive collections, however, has convinced me tliat the con- 

 tinental forms, on the one hand, and the insular ones, on the other, can be readily dis- 

 tinguished, and really form two very weU-marked species. The red lunules at the anal 

 region beneath characterize all specimens from India (Androgens, 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 sur- 

 face 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. Doubledaiji, WaU.). 



45. Papllio Lampsacus, Boisduval. 



P. Lampsacus, Bd. Sp. Gen. Lep. p. 190; De Haan, Verb. Nat. Gesch. p. 23, t. 2. f. 2. 

 Hab. Java {<S) [Wall). 



46. Papilio Priapus, Boisduval. 



P. Priapas, Bd. Sp. Ge'n. Lep. p. 190; De Haan, Verb. Nat. Gesch. p. 23, t. 2. f. 1. 

 Hab. Java [Boisd.), Sumatra [Raffles), Borneo (De Haan). 



