556 Mr. Guy A. K. Marshall's 



spots of discal row in liindwing (I have taken one very 

 strongly marked 6, in which the latter was present). 

 The sub-basal spot below median nervure in forewings 

 is very much reduced and often obsolete. 



The underside is as in nohara, but the ground-colour 

 in hindwing is of a rich pink outwardly tinged with 

 ochreous ; basal half of cell and a broad, irregular, trans- 

 verse, discal band whitish, and third, fifth, and ninth 

 spots of discal row wanting. 



Dry season form. Larger ground-colour dull ochreous, 

 black markings as in summer form, but spots decidedly 

 larger. Underside much paler and duller. White mark- 

 ings almost obsolete. 



? Wet season form. Ground-colour dull, pale grey, 

 with faint ochreous inter-nervular rays in forewing. 

 Markings as in wet season form of male, except that the 

 black hindmarginal borders in both wings are broader, 

 and suffused on their inner edges. On the underside the 

 forewing is much paler, shining, inter-nervular rays more 

 distinct. Hindwing pale-yellowish creamy, basal half 

 variegated with patches of pink; markings as in 6. 



Dry season form. Larger, ground-colour as in dry 

 season form of 6 ., but with basal half of hindwing suffused 

 with pinkish. Spots strongly developed, larger than in 

 preceding form ; inner edge of margin in hindwings 

 clearly defined and not suffused. Underside as in dry 

 season forms of 6 . 



This species exhibits a greater amount of seasonal 

 variation than any South African, J.c7-^a I know; but 

 the change in the J cannot be properly appreciated in 

 dried specimens owing to the way m which the brilliant 

 colours of the summer form fade. The specimens de- 

 scribed are the extreme forms, and every grade between 

 them can be found. The variation is most curious, as the 

 black spots are much larger in the winter form instead of 

 in the summer one, which shows how impossible it is to 

 lay down any hard and fast rule in such matters. Owing 

 to this development of the spots, the winter form pre- 

 sents a greater general resemblance to A. nohara, but the 

 two cannot possibly be confused. 



Several of the most striking and curious instances of 

 seasonal dimorphism were passed over in Mr. Barker's 

 paper. I will therefore now shortly refer to them. 



When collecting specimens of the handsome genus 



