Papilio dardanus {incro'pc) and Acrxa johnstoni. 309 



GoJman {protcina of Obertliui-) difFers from faJJax and 

 lijcoa in that it is not sexually dimorphic. I have found 

 males and females both present in the semifuhesccns form 

 and the white-spotted Amauris-like forms. Both sexes 

 would probably be found in a sufficient series of any 

 variety. It also differs in possessing squarish as compared 

 with a rounded discal hind-wing patch, which is also more 

 sharply defined because less invaded by internervular radii. 

 In fallax the contour of the fore-Aving has greatly approxi- 

 mated from h/coa towards johnstoni, but the apex is still 

 slightly more broadly rounded, and the costa of the fore- 

 wing rather more bent. On the other hand, a concavity 

 between the apex and the posterior angle, although faint or 

 absent in the females, has now become distinct in the males 

 offallai\ — as distinct as '\n johnstoni. In this respect and 

 the more uniformly dark ground colour of the hind-wing 

 outside the discal patch these extreme eastern forms of 

 I'l/coa show an approach to jolunstoni. The basal spots of 

 the hind-wing under-side remain however precisely those of 

 the western lycoa. 



A most curious change in lycoa as we advance from 

 west to east is the shrinkage of the discal patch to a 

 minimum at the N.E. of the Victoria Nyanza and its 

 subsequent slight expansion further east. 



In the collections I have already mentioned supplied 

 by the generosity of many friends AcriBct johnstoni was 

 first found (in about equal numbers) accompanying the 

 forms of lycoa. {falla-v) in the Tiriki Hills; and in far 

 greater numbers at Kilimanjaro, Taveta, and Taita. The 

 great majority are easily separated from the lycoa {fallax) 

 forms by the characters already mentioned but interme- 

 diate individuals certainly occur. The most striking of 

 these appeared among four males sent to me from the 

 Kenya District by my friends Mr. and Mrs. S. L. Hinde. 

 Of three specimens captured on February 8, 1903, at Fort 

 Hall (about 4000 feet) two are obvious jolmstoni while the 

 third possesses a well-defined buflt' patch intermediate in 

 outline between fallax and johnstoni. The basal spots of 

 the hind-wing under-side resemble those of fallax. On 

 the other hand, the spots of the fore-wing are white and 

 not buff as in the males oi fallax. The fourth specimen, 

 captured above the Goura River (5-7000 feet) February 2] , 

 1903, is somewhat nearer to fallax and the fore-wing spots 

 are buff". A very fine intermediate example also exists in 



