( cxxiii ) 



evidently the CMse in M. jacksoni, and may also be seen in J/. 

 ruppellii and M. agathina. The lateral connections between 

 the ribs in the proximal part of the scale are especially prom- 

 inent in M. jacksoni. In M. rubricosta the ribs of the distal 

 part, after their original divergence, appear to converge and 

 then again to separate slightly ; the interstitial membrane 

 ceasing at the point of nearest approach. The disc, which 

 preserves the same bilobed character throughout the genus, is 

 large in M. cMwis and M. agathina, moderate in 21. rujjpdlii 

 and M. phileris, small in M. hernice, M. rubricosta, M. popj^ea 

 and M, jacksoni. The scent-scales from one of the transitional 

 forms between J/, chloris and M. agathina bear a closer 

 resemblance to the latter -than to the foi-mer. Two specimens 

 of '■'■ M. p)oppea^' show differences in the form of the lamina, 

 one having definite cornua and a less strongly-marked median 

 constriction. Both are from Lower Nigeria. A feature 

 especially well seen in Mylothris is the convergence of the ribs 

 of the scent-scales proximally towards the footstalk, pre- 

 sumably to take up the odoriferous substance conveyed by the 

 latter. In scales of the ordinary type, the ribs take through- 

 out a nearly parallel course, with little or no reference to the 

 footstalk. This applies to all geoera. 



In the genus Elodina I have so far failed to find scent- 

 scales. In the species of Nycldtona from Africa I have been 

 equally unsuccessful, though I have examined many specimens 

 of the different forms to be found in that continent. After 

 this experience, I scarcely expected the Asiatic Nychitona to 

 yield any positive result : however, on examining a preparation 

 taken from a specimen of Nychitona xijjhia captured at 

 Singapore, I was agreeably surprised to find numerous plume- 

 scales of a form different from any that I had previously met 

 with. The lamina of these structures is shaped like the blade 

 of a mason's or bricklayer's trowel ; the apex is sharp and the 

 base rounded. The fimbriae are rather long and distinct, the 

 footstalk straight, the disc cylindrical with a proximal orifice. 



The Hope Collection possesses a co-type of the large 

 Nychitona captured by Wallace in Celebes, and described by 

 him as Pontia dione. Scent-scales from this specimen are of 

 the same general character as those of N. xiphia, but the 



