252 PSEUDACRAEA EURYTUS 



of the black bar separating the orange areas on the fore 

 wing, and when this is completely eliminated the form 

 described by K. Griinberg ^ as a distinct species 

 " impleta " is obtained. It would not require a great 

 change to develop the male form of rogersi ^ from impleta. 



Another form known as obscura was also described 

 by Neave in 1904, and is one of the group from Uganda 

 coming under the subhead of hobleyi. This is also a 

 monomorphic form, male and female being alike, as are 

 the models, the eastern form paragea of Planema epaea, 

 a common West Coast Acraeine.^ The model is rather 

 rare, and the mimic obscura is also rare. It has pale 

 creamy markings, easily derivable from those of terra, 

 but much smaller, on a dark greyish brown background. 

 The pattern of these creamy markings does not follow 

 so exactly the pattern of the model as does that of terra, 

 but the general effect is decidedly that of resemblance. 

 As regards flight, there is much more difference between 

 model and mimic in this case than with the other members 

 of the hobleyi group, for paragea the model has rather 

 a weak fluttering flight, and looks a feebler insect than 

 the robust and powerful Pseudacraea. 1 have never 

 mistaken obscura for its model. Both show a certain 

 amount of reddish brown at the base of the under surface 

 of the hind wing, but this is of a paler tint than the rich 

 umber that makes the characteristic basal triangle of 

 hobleyi, tirikensis, poggeoides and their models, and is 

 not so sharply defined. 



The form obscura seems to be the least fixed of the 

 Uganda forms of eurytus comprising the hobleyi group ; 

 at any rate, on the islands it was quite difficult to obtain 

 two that were closely alike and did not show transition 

 to one of the other forms. 



Lastly, there is the extremely rare and little known 

 form from near Mombasa, British East Africa, described 



^ Sitzungsber. d. Oes. NaturJ. Freunde, Nr. 4, 1910. 

 2 Plate II, fig. 2. 3 Plate I, fig3. 3, 4. 



