( 13 ) 



(Nyangori) example. The submarginal spot (a) is wanting 

 from 48 (although present on the under surface), but not 

 from either of the other specimens. The apical spot (8) is 

 well developed in all. 



The planemoides form is entirely unknown in Natal, and 

 indeed in areas far to the north of it, and hence it is im- 

 possible to adopt the plausible interpretation of leiyhi as a 

 hybrid between cenea and a male bearing the planemoides 

 tendency, or vice versa. We are therefore driven to the 

 hypothesis that the leighi form is a persistent definite stage 

 in the evolution of planemoides. 



My friend Mr. Roland Trimen, F.R.S., has kindly sent me 

 (August 14, 1911) the following account of three specimens 

 in his collection which possess the leighi pattern, but differ in 

 the uniform ochreous tint of all the markings : — 



"As regards the curious form of $ P. dardanns you write 

 about, which Leigh has sent from Natal, and which you say is 

 really the same as the one you figured in Trans. Ent. Soc, 1906, 

 PI. XX, f. 1, from N.E. of Victoria Nyanza, I have been look- 

 ing up my lot of the S. African sub-species, and find 3 examples 

 which approximate your fig. 1. The first and second of these 

 you will find noted in my " S. Afr. Butt.," iii, p. 249 (under 

 "B.h." in the text), and treated there as linking hippocoon 

 and trophonius; the St. Lucia Bay example was taken by 

 Col. H. Tower in 1867, and the Delagoa Bay one by Mrs. 

 Monteiro in 1883. The third was captured at Morakwen , 

 xlii] 



Delagoa Bay, by Rev. H. Junod, 22nd January, 1891. In 

 all three the inner-marginal fore- wing patch and the hind-wing 

 patch are larger than in your fig. 1, but vary in size. All the 

 markings in all three are rather strongly tinged with dull 

 ochreous-yellow. Your fig. 1 is not coloured, but you give 

 some account of the colouring in the " Explanation " and at 

 pp. 293-4, from which I gather that the tint of the fore- wing 

 (but not that of the hind-wing) markings is much deeper and 

 richer, and more like that shown by planemoides, than any one 

 of my three $ 9 exhibits. In my specimens all the markings 

 are of about the same pale ' buff ' tint, with only a slight 

 inclination to a rufous tinge. 



