( 80 ) 



scent-scales are of the general pigea character, but longer and 

 narrower than in the Natal representative of that species. 

 Forms of the pigea group from British E. Africa and Uganda 

 depart from the Central African type and approach the Natal 

 pigea in size, in general aspect, and in the character of their 

 scent-scales, though the latter have usually a more marked 

 basal expansion. The resemblance to M. agathina also tends 

 to disappear in specimens from these more northern regions. 

 But in a pigea form from Toro (Uganda), which is perhaps to 

 be identified with P. rubrobasalis, Lanz, the resemblance to 

 M. agathina is once more considerable. That this is distinct 

 from the ordinary pigeo-iarm (which also occurs in Toro) is 

 made probable by the fact that its scent-scale is peculiar 

 in the attenuation of its basal expansion, thus contrasting 

 markedly with the scent-scale of the allied insect inhabiting 

 the same district. The basal flush and black marginal spots, 

 so characteristic of Mi/lothris. are in this Toro rubrobasnlis 

 especially well marked. In these particulars it corresponds 

 with Butler's J', ustarte, but is readily separable from that 

 insect by its inferior size and distinctive scent-scale. 



/'. dixeyi, Neave, also from Torn, is in both sexes very like a 

 Phrissura. It is. however, clearly shown to be a Pinacopteryx 

 both by its neiiration and also by its scent-scales. These have 

 the usual Pi a acopte /•;/.'■ character, but are larger and longer 

 than any in the pigea group, having a widely-expanded and 

 rounded base, much like that of P. liliana shortly to be 

 noticed. The outline recalls that of a chemist's flask with a 

 very long neck. 



In the small yellow species, V. tpilleri, Spill. (Natal and 

 British ES. Africa), the Bcent-scale is rather short, with a 

 widely-expanded and angulated base. 



[cxiii 



There remains the group of species headed by P. char 'ma, 

 Boisd. In all of these the accessory disc is large, the base is 

 abruptly expanded, and the distal portion of the lamina has 

 its sides parallel. The species of this group may be said to 

 be geographical representatives. In /'. charina, Boisd. (Cape 

 Colony and Natal), the scent-scale is like a chemist's com- 

 bustion-tube. In /'. si, nana, llopff. (N.E. Rhodesia; Portuguese, 



