le 
aurivillii females of alciope, which are certainly ancestral in the 
latter. Whether they are also ancestral in the Planema is a matter 
for future enquiry, involving the examination of long series of local 
forms of Pl. macarista over all parts of its range and the careful 
comparison of this species with its near allies. With the facts as 
we know them at Entebbe there are good reasons for believing in 
a possible diaposematic relationship; but the whole subject is so 
complex and difficult that I should not venture to make a more 
definite statement until further investigations have been under- 
taken. 
I. The broad fulvous band which in many specimens borders 
the white bar of the hind wing. — This feature is, in my exper- 
ience, much commoner in the Acr@a mimic than in the Planema 
model, but, when it zs present in the latter, bears the strongest 
superficial likeness to that of an aurivillii female in which the 
marking is developed to an equal extent. Comparison with the pat- 
tern of the male a/ciope, and especially with that of western forms of 
the female and their modification at Entebbe, proves beyond doubt 
that the feature is ancestral in this latter species. 
It is worthy of remark that a similar brown margin to the discal 
white bar of the hind wing is developed in a small proportion of 
the white (carmentis) females of Acrea jodutta. 
2. The serrated outer margin of the lower (inner marginal) half 
of the fulvous bar crossing the fore wing. — This feature, which 
goes far to produce the remarkably close resemblance between the 
male macarista and the female alciope, also deserves consideration 
as a possible instance of diaposematism. Not only are the serr- 
ations relatively deeper and more numerous (4 crests and 3 valleys 
to 3 crests and 2 valleys in the Planema) in the Acrwa, but they 
are shown by comparison with other forms of the female and with 
the male, in which however they are far less marked, to be 
undoubtedly ancestral. On the other hand the feature is found, 
although not always developed to an equal extent, in the female 
as well as the male Planema. 
The serration is produced in a manner common in Butterflies, 
viz. by the extension of a coloured area outward along the veins, 
leaving a V-like indentation in each internervular region. It is not 
so much the serration itself, as its restriction to a corresponding 
part of the pattern, that constitutes evidence of mimetic approach 
from one side or from both. 
