404 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. IX. 



tipped with orange-yellow. Hindleg has the tibia greatly swollen, 

 almost as much so as in I. mahintha, Moore. 



I. ionis is closely allied to I. mahintha, Moore,* from Silcuri, 

 Cachar ; the Khasi Hills ; Kalewa in the Chindwin Valley, Bernard- 

 myo, Theyetmyo, the Ataran Valley, the Daunat Kange, and Kun- 

 padie— all in Burma, from which it differs in the shape of the " male 

 mark," this latter in J. mahintha being very broad, as broad as long, 

 instead of four times as long as broad as it is in I. ionis. In 

 I. mahintha the " male-mark " is somewhat variable, being in 

 some specimens a solid square, in others it is broken up into two, three, 

 or four streaks, the streaks being separated from one another by the 

 veins and internervular folds. The coloration of the upperside differs 

 in the two species also, the long setse which clothe the wings being 

 orange-yellow in I. ionis, rich orange-red in I. mahintha. I. ionis has 

 no discal hyaline spots on the forewing, in I. mahintha there are two 

 in the female divided by the second median nervule ; usually two (but 

 the spots, especially the posterior one, are always smaller than in the 

 female), always one, in the male on the underside, the anterior one of 

 these in the second median interspace sometimes shewing through on 

 the upperside, sometimes absent. On the underside /. ionis has a pro- 

 minent discal purplish-white band across both wings, in I. mahintha 

 there is the very faintest trace only of this band on the hindwing 

 in some specimens. I. ionis is also allied to I. antigone, Rober,f 

 from Flores, but from the figure that species appears to have the 

 " male-mark " reduced to two small round clumps of scales, and 

 the discal band on the underside is confined to the hindwing. 

 Lastly, I. ionis is allied to I. ilusha, Hewitson,t from Macassar 

 in Celebes, which, like I. mahintha^ has no discal band on the 

 underside, and has the "male-mark" on the upperside as large as 

 in that species, but of quite a different shape, being anteriorly 

 rounded. 



Described from a single example kindly given to me by Mr. H. J. 

 Elwes, captured by Mr. W. Doherty in the island of Sambawa in 

 September, 1891. He did not meet with this species apparently on 



* Proc. Zool. Soc. Loud., 1874, p. 575, pi. lxvii, fig. 4, male. 



t Tjjd. voor Ent., vol. xxxiv, p. 320 (1891); vol. xxxv,pl. v, fig. 6, male (1892). 



% Ex. Butt., vol. iv, pi. Ismene ii, figs. 10, 11, male (1867). 



