250 PSEUDACRAEA EURYTUS 



of the bar is that of the white bar of the female form 

 tirikensis in its most complete development : the colour, 

 however, is not the rather deep orange of macarista, but 

 the paler yellowish orange of the different species Planema 

 poggei, of which both sexes are alike, and in which the 

 direction of the orange fore wing bar is much more oblique 

 than in the male Planema macarista.^ The form of 

 Pseudacrdea now under discussion is thus brought to be 

 a mimic of poggei rather than of the male macarista both 

 in colour and direction of the bar across the fore wing, 

 the obliquity being given to the bar because it is of the 

 shape of that in the female form tirikensis, and not of 

 the male hobleyi. 



It is now incorrect to speak of a " female hobleyi 

 with male colouring " with this difference in shade 

 in the orange bar, and this form has been named 

 poggeoides by Professor Poulton.^ It is remarkably 

 interesting from the point of view of geographical 

 distribution. The models Planema macarista ^, and 

 PL poggei <^ ^, occur around Entebbe, but the 

 former is there more abundant and Pseudacraea eurytus 

 form poggeoides is very scarce, the females being almost 

 all of the form tirikensis mimicking the black and white 

 female macarista. But around Mount Elgon, in the 

 north-east of Uganda, Planema poggei completely replaces 

 macarista, which is not as yet known to occur east of 

 the Nile, and the black and white female forms tirikensis 

 are outnumbered by the form poggeoides with orange 

 bar across the fore wing like the model.' Since the male 

 of the mimic (hobleyi) has the bar on the fore wing orange, 

 the change in proportion of the two model Planemas 

 does not affect its appearance. 



Thus, in the case of the female forms poggeoides and 

 tirikensis, there is an exact parallel to th^ case of the 



1 Plate I. figa. 9, 10. - Proc. Ent. Soc, 1912, p. cxvii. 



' Ibid., pp. Ixx.-lxxi. 



