( cix ) 



D. leucanthe and D. lycimnia the fimbriae seem sometimes to 

 be connected infeviorly with the body of the scale by a trans- 

 parent triangular membrane. Tiiis recalls an appearance 

 occasionally to be seen in veritable hair-scales, which structures 

 the present scales also frequently resemble in being rather 

 heavily charged with pigment. That these curious organs are 

 really scent-scales is made probable by the fact that they are 

 confined to the male sex ; but they differ from every other 

 kind of plume-scale known to me in being found on the under 

 as well as the upper side of the wing of their possessor. In 

 this respect they conform to the condition that is often seen 

 in scales that are congregated into definite sexual brands or 

 patches, but is never to be observed, so far as I am aware, in 

 the normal plume-scale. 



The African genus Pinacopteryx forms a very natural 

 assemblage ; in its neuration resembling Belenois, but differing 

 widely from that genus in respect of its plume-scales. These 

 are characterised by the expanded, usually rounded bases of 

 their laminae. In the West Coast species Pmacopterijx cebrorf 

 and P. falkensteinii, especially in the former, the lamina is 

 long and tapering and the base angulated. In P. falkeTisteinii 

 the disc is unusually large. The plume-scale of P. dixeii from 

 Toro is like that of P. falkensteinii, except that the disc is 

 very much smaller. The forms grouped together as P. j)ig6a 

 and P. astarte, including Mr. Neave's striking series from N.E. 

 Rhodesia and the Congo, exhibit the same general character 

 of a long, narrow, tapering lamina with a more or less ex- 

 panded and rounded base, and moderate-sized disc. In P. 

 orbona from the West Coast, and a specimen from Toro which 

 is probably to be identified with P. rubrobasalis, the base, still 

 rounded, is less expanded, and the lamina less tapering. P. 

 vidua has a distinctive scale somewhat of the jngea type, but 

 much shorter and rather broader in proportion. The scent- 

 scale in P. spilleri is also of the jjiyea type, but with a more 

 expanded base, which show* a tendency to angulation. These 

 structures do not share in the yellow pigmentation of the 

 ordinary scales of this species. A well-defined section of 

 Pinacopteryx is formed by P. doxo, P. simana, P. charina and 

 P. liliana. The base in these forms is expanded, as in all 



