298 Professor E. B. Poulton on Minetic Forms of 
(omitting from consideration the one that has been acci- 
dentally injured) possesses a pale brownish edging also 
characteristic of the male. 
In the fore-wing the yellow male streaks and patches 
are strongly developed on the disc below the cell. It is 
deeply interesting to observe how sharply cut off they are 
when, crossing the lower part of the fulvous band, they 
reach the black border. We are driven to infer that this 
portion of the border almost precisely corresponds in the 
two sexes and that the black border of this and other 
female forms is inherited unchanged from an ancestor like 
the male. In fact this character carries us further back 
than the ancestral ¢riment form (Plate XVIII, Fig. 1) in 
which the male border has already been greatly modified. 
It is to be observed furthermore that the abrupt termination 
of the yellow streaks confers upon the black border a 
sharpness of outline entirely wanting in the female form, 
as is at once seen when the right and left sides are com- 
pared. Opposite to the middle of the hind margin the black 
border is invaded by an outward extension of the fulvous 
band—due to that part of it which represents the sub- 
apical bar of the hippocoon 2 form (compare Figs. 2 and 4 
on Plate XVIIT). Here the ancestral male border has 
been much reduced, and in the gynandromorphic specimen 
the site of the invading fulvous concavity is in part covered 
by grey scales quite distinct from the yellow ones on those 
parts of the wing surface which are yellow in the male. The 
photographic method however only imperfectly renders 
the difference. 
(n) Mimetic relationships and distribution of planemoides. 
This beautiful form, only recently recognized as a mimic 
of Planema pogget by Trimen and Neave (Proc. Ent. 
Soc. Lond., Oct. 7, 1903,) is not known to occur as a 
female form of any sub-species of dardanus except merope 
(= dardanus dardanus). The occurrence at Taveta of a 
fine variety of Acrwa johnstont (Plate XXI, Fig. 2a) 
strongly convergent towards planemoides renders it probable 
that this latter exists in the neighbourhood, perhaps as 
one of the female forms of the sub-species ¢iullus. The 
immense increase in our knowledge of planemoides during 
the last two or three years encourages the hope that we 
shall at no distant date be fully acquainted with its range. 
