( xxxviii ) 



the hind-wing, greatly inci'eased in size. A similar form from 

 China has an indication of an orange flush on the fore-wings 

 in a still more attenuated form than G. taurica. This Chinese 

 form appears to be a seasonal phase of G. acuminata, Feld., 

 which inhabits the same districts, together with Burma, and 

 is marked by extreme angulation of tho wings. G. zaneka, 

 Moore, is a similar highly-angulated form from northern India. 

 G. aspasia, Menetr., is an acuminata-liko type from Amurland, 

 .and a large race of acuminata from Japan has been named 

 G. maxima by Butler. 



"Additional data concerning the local and seasonal occur- 

 rence of those various forms are much needed. In tho mean- 

 time certain points appear to be tolerably clear. Each of the 

 forms maxima, acuminata and aspasia seems to occur under two 

 phases ; one distinguished by a lower degree of angulation 

 and a comparatively smooth surface in the wings of both 

 sexes, and by a richer and deeper yellow in the colouring of 

 the males ; the other having the fore-wings strongly uncinated, 

 with the wings showing a mealy surface much liko that of G. 

 farinofta, and the colouring in the male generally paler. There 

 appears to be some reason to suppose that these parallel phases 

 in the three forms have a seasonal significance, and they were 

 arranged by Mr. Butler in the National Collection in accord- 

 ance with that view; tho smooth-surfaced, deeply-coloured, 

 less highly-angulated phase being considered to belong to the 

 wet season, and the other to the dry. If this be so, it is 

 interesting to observe that the same relation between dry 

 season and uncination of the fore-wing obtains in the case of 

 this genus as in the other instances from Pierine geneiw 

 (Pt/risitia j)rnter)ii<(, and Teracohu cmxo) to which I drew 

 attention in the volume of our Transactions for 1903, p. 157, 

 and Plate VII, figs. 1-8. It is also significant in relation to 

 the principle thero laid down, that tho most highly angulated 

 forms to be met with in the genus are the supposed ' dry- 

 season ' females, especially, it may be noted, those of G. 

 acuminata. Now what over he the relation between the two 

 'seasonal' phases of the three forms just mentioned, I have 

 little doubt that the same relation holds between G. mpafonsis 

 and G. zaneka ; and I am quite prepared to find that these two 



