1884.] 



L. de Niceville — Calcutta Butterflies. 



187 



" In addition to the absence or presence of ocelli, some of these 

 seven species present other seasonal differences. In Mycalesis perseus 

 and M. mineus on the underside in the rains generation the discal white 

 line is very prominent, it is obsolete in the dry season generation ; and in 

 the latter form of M. mineus, the forewing is much more produced at the 

 apex, making the outer margin straighter. In the dry season form of 

 M. leda the forewing is more falcate, and the underside is not striated. 

 In Junonia almana also there is some considerable difference between the 

 two generations in the outline of the wings, in the dry season form the 

 forewing is much more falcate, and the hindwing has the anal angle 

 produced into a short ' tail,' these characters being present in the wet 

 season brood, but they are less conspicuous. 



" Should my conclusions with regard to these species be accepted, 

 considerable changes will have to be made in the synonomy of all of 

 them. In my paper I have not gone fully into this matter, but the 

 following short table will bring out the principal points : — 



Combined name 



by which the 



Dry Season Form. Wet season Form. m .. , , -, 



J species should 



be known. 



Mycalesis indistans, Moore. 



„ perseus, Fabricius. 



,, runeka, Moore. 

 Melanitis ismene, Cramer. 

 Ypthima marshallii, Butler. 



„ howra, Moore. 

 Junonia almana, Linnaeus. 



M. mineus, Linnaeus. 



M. mineus. 

 M. perseus. 

 M. medus. 

 M. leda. 

 Y. philomela. 

 Y. huebneri. 

 J. almana. 



M. blasius, Fabricius. 



M. medus, „ 



M. leda, Linnaeus. 



Y. philomela, Johanssen. 



Y. huebneri, Kirby. 



J. asterie, Linnaeus. 



" There is one other matter which I would like to bring to your 

 notice, and that is the probability that Papilio dissimilis and P. casyapa 

 are one and the same species. In appearance, as you will see at once 

 from the specimens exhibited, they are exceedingly dissimilar, but from 

 the fact that the larva of both feeds on the same plant, that the larva and 

 pupa of both are indistinguishable the one from the other in form, mark- 

 ings and colouration, and lastly that nearly everywhere where one of these 

 two species, or allied forms, occur, there the other will be met with, I 

 have but little doubt in my own mind that they are dimorphic forms in 

 both sexes of one species. This matter can only be conclusively set- 

 tled by breeding from the egg, and I hope soon to be able to carry out the 

 experiment." 



" I have described one new species only in this paper, which is allied 

 to Gatochrysops pandava. I have named it G. bengalia." 



