the charina Group of Pinacopteryx. 195 



P. charina from Weenen, Natal (fig. 2). it is also long, 

 but markedly less so than in P. liliana. The terminal 

 spine in a P. simana from Gazaland (fig. i) and a P. rani to 

 from Gondokoro, White Nile (fig. 5), is short; it is some- 

 what blunter in simana than in venata. A point to be 

 noted is that, judging from these examples, the clasper of 

 charina, a comparatively small form, is not much less in 

 size than that of liliana, decidedly a larger insect. The 

 claspers of simana and venata are much smaller. In all 

 four forms the terminal spine is furnished at its free ex- 

 tremity with a socket from which proceeds a group of 

 chitinous bristles. These are not represented in the figures. 

 The socket is indicated at s. 



Fig. 4.— P. simana, Hopff. Fig. 5. — P. venata, Bull. Spine of 



Spine of clasper X 54. clasper ; . 54. 



There is also a difference to be observed between the 

 two sections of Pinacopteryx, in reference to the character 

 of the uncus. This structure in the charina group is com- 

 paratively slender, and rather sharply pointed. The dorsal 

 margin is slightly sinuous in outline, and the distal portion 

 of the uncus is curved downwards, sometimes so decidedly 

 as to give the organ almost a sickle-shaped character 

 (fig. 7). In the pigea group, on the other hand, the dorso- 

 ventral dimension is proportionately greater, the live 

 extremity is comparatively blunt, the dorsal margin is 

 uniformly convex, and the curve of the organ, though 

 present, is less pronounced (fig. 6). 



(2) The Scent-scales. — These, as elsewhere noted, present 



