294 Professor E. B. Poulton oji MimrMc Formn of 



comparing the intermediate form (Plate XX, Fig. 1) with 

 plcmemoides represented below it (Fig. 2), and with the $ 

 f. cenea, represented on Plate XVIII, Fig. 8. The colour 

 of the markings is the deep rich tint of planemoidcs, not 

 the far paler shade of ccnca. 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 j;/fMic?rtow?es 

 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 

 the origin of 2>^ctncmoides from the cenca form. 



(/3) ^ form intermediate hdwecn 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 ]iipp)ocoon) 

 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 XVIII, Fig 2) or even more of trim.cni 

 (Plate XVIII, Fig. 1). Fig 8, on Plate XX, compared w^th 

 the fine example of typical p)lancmoidcs represented in Fig. 

 4 suggests the origin of the latter from hippocoon or 

 trimeni. 



(y) ^ form intermediate letivccn trophonius and. planemoides. 



Only quite recently Mr. Harry Eltriugham, F.E.S., has 

 kindly shown me a beautiful coloured representation of a 

 specimen from Entebbe which is intermediate between 



