( oxii ) 



B. teutonia and B.peristhene are of the mesenthia type, those of 

 B. clarissa tend to be laterally compressed and somewhat 

 tapering. The disc in all species of Belenois except B. gidica 

 is large, chestnut-shaped and opaque by transmitted light. It 

 is apparently filled with a closely-packed convoluted chitinous 

 tube. 



No plume-scales are discoverable in the genus Prioneris. 

 This was noticed many years ago by Watson, and is commented 

 on by Wallace in his valuable paper on the Eastern Pierinae. 



In the great Oriental and Australian genus Delias we come 

 to an entirely different kind of scent-scale from those already 

 dealt with. The lamina is usually large, and more or less 

 tapering towards the distal extremity. The base is generally 

 rounded, and the apex filiform, having, with the fimbriae, a 

 really plume-like appearance. The sculpturing of the lamina 

 with a moderately high power looks granular ; in several 

 species, notably D. harjjolyce, D. gahia and D. agostina, the 

 granular arrangement is modified along the course of the axis, 

 giving the idea of a central coi^e. This may be well-defined, as 

 in the first of the species named, or diffused as in D. aganippe. 

 The lamina may be called kite-shaped in D. pyramus, D. nini(,s, 

 D. egialea and other members of the pyramus group ; pyriform 

 in D. agostina ; tadpole-shaped in D. belladonna. In the 

 helisama section the lamina resembles an Indian club re- 

 versed ; that of D. indistincta, from its nearly squared base, 

 is like an elongated champagne-bottle ; and similar contours 

 are shown by D. nysa, D. tnomea, the aganippe and isse groups. 

 The scent-scales in these species are mostly very long, in 

 correspondence with the ordinary scales of the wing. They 

 are often abundant, occasionally even seeming to outnumber 

 the ordinary scales, and in common with these latter are, as 

 a rule, easily detached. The disc is usually large, frequently 

 kidney-shaped, and often with the internal chitinous 

 structure especially well-marked. In D. momea it is exception- 

 ally small ; in D. aruna it is cocked-hat shaped. In the 

 pyraimis group there is generally a sharpish median proximal 

 pr-ojection. The scales are long in the helisama and aganippe^ 

 comparatively short in the isse assemblage. The pyramus 

 section in this respect is intermediate. 



