90 MIMICRY IN EAST AFRICAN BUTTERFLIES 
belong to a different section of the genus from P. dardanus. 
Here again the males are non-mimetic and are dark brown 
insects with a continuous pale stripe across all the wings, 
broadest in the hind wings and becoming macular in the fore 
wings. The females are very close mimics of A. albimaculata, 
as may be seen in the plate. Unfortunately the specimen of 
the Cenea form of P. dardanus here figured is not only much 
shattered but is also distinctly intermediate towards the black 
and white form. Generally it is also an excellent mimic, and 
there can be no doubt that the three mimics resemble each 
other more closely than they do the model. Associated with 
these there is the ordinary form of Acraea johnstoni, of which 
we have seen that there is a form mimicking the Dorippus 
form of Limnas chrysippus. This is a smaller butterfly than 
any of the Papilios and the resemblance is rather in general 
coloration than in exact pattern ; but as this species has many 
different forms, all of which bear a considerable resemblance 
to distasteful species, and itself belongs to a genus well known 
to be distasteful, there can be no doubt that the mimetic 
interpretation of these resemblances is correct. It is certainly 
remarkable that, in spite of its wonderful powers of adaptation, 
it as a rule does not attain to the exact and wonderful resem- 
blance which we have seen to exist in other species — but it is 
possible that the adaptation is still proceeding. 
Moreover Acraea johnstoni itself is mimicked by a species 
of Neptis, N. woodwardi, in a very convincing manner, and 
Professor Poulton has shown that the resemblance is much 
closer east of the Rift valley, where this combination is most 
dominant, than it is further to the west. It is at least possible 
that N. woodwardi should be regarded as a Batesian mimic, 
but it should be borne in mind that mimicry is very charac- 
teristic of this genus and numerous other examples are known 
from India and elsewhere, whilst we have seen that several 
species of Neptis are probably to be included in the large black 
and white association, and I have myself suggested that Neptis 
incongrua may be a mimic of Eurytela hiarbas. At any rate 
there can be no doubt that the whole genus participates to a 
marked degree in the slow leisurely flight so characteristic of 
distasteful butterflies, though I must confess that they are not 
