294 Professor EK. B. Poulton on Mimetic Forms of 
comparing the intermediate form (Plate XX, Fig. 1) with 
planemoides represented below it (Fig. 2), and with the ? 
f. cenea, represented on Plate XVIII, Fig. 3. The colour 
of the markings is the deep rich tint of planemoides, not 
the far paler shade of cenca. The fusion of the three spots 
grouped round the outer end of the cell, and the shape of 
the marking thus produced, is almost precisely as in the 
specimen shown on Plate XX, Fig. 2; while the spreading 
outwards and downwards of the chief spot (below the 
cell) reproduces the inner marginal end of the band of 
planemoides. ‘The central part of the band is wanting, but 
a tendency towards fusion can be detected in the figure 
and is far more evident on the specimen. The planemoides 
selected for comparison with this intermediate specimen, 
and shown in Fig. 2, is unusual owing to the overspreading 
of the white patch of the hind- wing by greyish scales. It 
is also a little abnormal and suggests transition towards 
the specimen above described (Fig. 1) in the separation of 
the spot within the fore-wing cell from the fulvous band 
(compare Figs. 8 and 4) and also in the comparative 
narrowness of the band itself, which is especially marked 
in the central portion where the discontinuity appears in 
Fig. 1. Figures 1 and 2 considered alone would suggest 
o 
the origin of planemoides from the cenea form. 
(8) & form intermediate between hippocoon and planemoides. 
The insect represented in Fig. 3 shows a tendency 
towards the hippocoon form in the extension of the fulvous 
band (representing of course the white of Aippocoon) 
towards the base of the fore-wing, along the inner margin, 
as well as in the trace of an invasion of dark ground colour 
dividing the band at its centre. The effect is to produce 
a considerable approximation to the fore-wing pattern of 
hippocoon (Plate XVIIT, Fig 2) or even more of triment 
(Plate XVIII, Fig. 1). Fig 3, on Plate XX, compared with 
the fine example ‘of typical. ‘planemoides represented i in Fig. 
4 suggests the origin of the latter from hippocoon or 
triment. 
(y) 2. form intermediate between trophonius and planemoides. 
Only quite recently Mr. Harry Eltringham, F.E.S., has 
kindly shown me a beautiful coloured representation of a 
specimen from Entebbe which is intermediate between 
