Geographical Distribution of Acraea lycoa, A.johnstoni. 8 



Niragonwe specimens. This form of the male is very 

 typical of Western Uganda. The females are not, however, 

 distinguishable from those of the more southern Urundi 

 District, all being characterised by the extreme paleness 

 of the hindwing patch. Passing round the north shore 

 of Lake V. Nyanza and on towards the south to the 

 Tiriki Hills this hindwing patch becomes more distinctly 

 yellow, whilst the males have developed the same feature, 

 accompanied by a darker ground-colour and greater dis- 

 tinctness and depth of colour in the forewing spots. 

 The male of this region is shown at fig. 6. Passing 

 southwards and eastwards we find at Kilimanjaro the two 

 sexes present much the same pattern, but the ground- 

 colour in both sexes is now very dark, the forewing spots 

 in the female are smaller, and the hindwing patch is 

 slightly expanded again. The sexvial dimorphism is still 

 well marked. Fig. 7 shows a female of this form which 

 is equivalent to the " Planema " fallax of Rogenhofer, and 

 the Acraea kilimandjara of Oberthiir. Tlie species has 

 developed to its maximum extent in mimetic approach to 

 Amauris echeria and A. albimaculata. Northwards, in 

 the district of Mt. Kenia, examples still resemble fallax, 

 but in several specimens the hindwing patch has a 

 slightly edentate distal outline between the third median 

 and the radial, giving the insect a marked resemblance to 

 A. johnstoni f. confusa. In two males from this district 

 the forewing spots are distinctly paler than the hindwing 

 patch, and up to this point in the geographical range of 

 the species this is the only sign of departure from a 

 hitherto consistent sexual dimorphism. This Kenia form 

 resembles fig. 7 on the upperside with the exception of 

 the slight difference in the hindwing patch, but the 

 insect is generally somewhat smaller. I have figured it 

 in monochrome on Plate II, fig. 7. On the underside the 

 difference is more marked. In fallax the ground-colour 

 of the forewings is dark sepia from the base to the inner 

 side of the white subapical spots, the whole apical area 

 being dusted with pale ochreous. In the Kenia form the 

 dark colour extends beyond the first three subapical spots, 

 and the whole of the underside has a generally blacker 

 appearance than in fallax. These forms are of excep- 

 tional interest, and are amongst the many valuable 

 specimens for which the Hope Department is indebted to 

 the generosity of the Rev. K. St. A. Rogers and Mr. and 



B 2 



