150 THE MALAYAN PAPILIONIDjE AS 



I find that in all essential characters the form and 

 texture of the wings, the length of the antennas, the 

 spotting of the head and thorax, and even the peculiar 

 tints and shades with which it is ornamented it 

 corresponds exactly with the other females of the 

 Fammon group ; and though, from the peculiar mark- 

 ing of the fore wings, it has at first sight a very dif- 

 ferent aspect, yet a closer examination shows that 

 every one of its markings could be produced by slight 

 and almost imperceptible modifications of the various 

 allied forms. I fully believe, therefore, that I shall 

 be correct in placing P. Romulus as a third Indian 

 form of the female P. Pammon, corresponding to P. 

 Melanides, the third form of the Malayan P. Theseus. 

 I may mention here that the females of this group 

 have a superficial resemblance to the Polydorus group 

 of Papilios, as shown by P. Theseus having been con- 

 sidered to be the female of P. Antiphus, and by P. 

 Romulus being arranged next to P. Hector. There is 

 no close affinity between these two groups of Papilio, 

 and I am disposed to believe that we have here a 

 case of mimicry, brought about by the same causes 

 which Mr. Bates has so well explained in his account 

 of the Heliconidaa, and which has led to the singular 

 exuberance of polymorphic forms in this and allied 

 groups of the genus Papilio. I shall have to devote 

 a section of my essay to the consideration of this 

 subject. 



The third example of polymorphism I have to bring 

 forward is Papilio Ormenus, which is closely allied 



