( 9 ) 



The above series of specimens shows a reversal in the pro- 

 portions of the two forms in the northern part of the range. 

 Thus in British E ist Africa the more conspicuous zoolina ap- 

 pears generally to preponderate over the more cryptic neanthes, 

 while in Natal the converse relationship holds. We are 

 reminded of Precis archesia in which also the more conspicuous 

 form pelasgis is abundant in the north, while the far more 

 cryptic form, archesia, is apparently rare. 



If the two forms of Charaxes zoolina are seasonal it is 

 evident that they are by no means confined to their respective 

 periods of the year. 



Dr. Karl Jordan stated that he was not at all surprised at 

 Mr. Leigh's I'esults ; for there were no structural differences 

 between zoolina and neanthes. He also said that other forms 

 in the same genus would doubtless require to be united in 

 Ixix] 



the same manner. The following account was subsequently 

 prepared by Dr. Jordan : — 



The experience gained by Mr. Leigh throws new light on 

 quite a number of forms of Charaxes. There are two Charaxes 

 of this group in Madagascar, betsimisaraka representing the 

 African zoolina, and hetanimena representing neanthes. These 

 two Malagasic forms both differ in the same way fi^om the 

 corresponding African Charaxes, which is additional evidence 

 for the correctness of the result of Mr. Leigh's experiment in 

 breeding. Further evidence is afforded by four West African 

 Charaxes, two of which have the facies of zoolina, while the 

 two others correspond in colour to neanthes. These four 

 Charaxes belong doubtless to but two species instead of four, 

 each species being dichromatic. One pair of forms is appar- 

 ently the West African sub-species of Charaxes zoolina, while 

 the other pair are a species distinct from Ch. zoolina. As the 

 zoolina-iovm. of the West African sub-species has no name I 

 propose to call it 



form plianera. 



It differs from the greenish and black zoolina of South and 

 East Africa mainly in the costal margin of the fore-wing 

 being less extended black, in the hind-wing bearing a distinct 

 pointed tail at the lower radial (as in ehmkei !), and in the 



