( cxi ) 



made some remarks on the Pierine genus Pinacopteryx, 

 illustrating them by exhibiting male and female specimens of 

 most of the species, side by side with which were shown drawings 

 made to scale of the plumules characteristic of each form. 



He said : Pinacopteryx may be regarded either as a separate 

 genus, or as a section of Pieris, the latter being the course 

 adopted by Mr. Trimen in his work on South African 

 Butterflies. It is a perfectly natural and circumscribed 

 group, of which all the members are confined to the African 

 Continent, with a species or two in Madagascar. The plume- 

 scales with which the males are provided show a general 

 family resemblance, together with interesting specific differ- 

 ences. Their most characteristic feature is the expanded 

 base, either rounded or angulated, of the lamina. In the 

 distal portion of the lamina, the sides run nearly or quite 

 parallel. Some of the species of Pinacopteryx are not easily 

 distinguished, and in certain public collections there is a good 

 deal of confusion between different forms. In cases of 

 difficulty, much help is afforded by an examination of the 

 plume-scales. 



In West Africa we have the large pale-yellow form P. 

 cebron, Ward, which inhabits the Gold Coast, S. Nigeria and 

 the Camaroons. Its scent-scale is long and tapering, with an 

 angulated base. Further south comes P. falkensteini, Dewitz 

 (Angola ; Congo), also large, but white instead of yellow. 

 The plume-scale is much like that of P. cebron, but shorter. 

 It has an unusually large accessory disc. 



P. orbona, Hiibn., also from the W. Coast, looks like a 

 small specimen of the last, but has a quite distinctive scent- 

 scale, in which the basal expansion is much diminished. 

 P. vidua, Butl, (Upper Nile and Br. East Africa) is somewhat 

 like the last species. Its scent-scale, however, is very short, 

 broad in proportion, and with a widely-expanded angulated 

 base. 



B. pigea, Boisd. (Natal), of which P. alba, Wallgrn., is the 

 dry-season phase, has a plume-scale with regularly rounded 

 base and rather small accessory disc. In N.E. Rhodesia, 

 Nyassaland and German E. Africa occiirs a form closely 

 allied to pigea, but generally larger, and frequently showing 



