(oats) 
Dr. Dixry further remarked that though attention had 
already been drawn to several of these cases of resemblance 
by Mr. Trimen, Prof. Poulton, Mr. Neave and others, as well 
as by himself, they had not before been shown together in one 
view. In some instances the superficial resemblances between 
insects of very different genera belonging to this series had 
led to much confusion in the nomenclature, for an example of 
which he would refer to the facts given in Mr. Trimen’s 
‘‘South African Butterflies,’ Vol. iii, 1889, p. 35 and note. 
The five genera now shown, though all belonging to the 
Pierinex, were not closely related ; Pinacopteryx and Belenots 
probably stood nearest to one another in point of affinity, but 
were still abundantly distinct. Mylothris occupied an isolated 
position, while Phrissuwra was allied to the Hastern genera 
Tachyris, Catophaga and Appias. Leuceronia was widely 
removed from all the rest. Hence there was little or nothing 
to support the suggestion that these likenesses might be 
merely the consequence of affinity. 
It was worthy of note that some form of the genus Mylothris 
was usually to be found at the centre, so to speak, of each of 
these different colour-assemblages. But this was not invari- 
ably the case, and it not infrequently happened that the 
species of other genera showed a closer resemblance to each 
other than either of them did to the Mylothris. This was 
perhaps especially the case as between the two genera Belenois 
and Pinacopteryx, but striking instances also occurred between 
Phrissura phaola gand Belenois theuszi $, and between Phris- 
sura isokani 2? and the female of a Belenois allied to B. thysa. 
It was a further point of interest that the streaky character of 
the dark margin of the wings, well seen in MM. poppea,?, 
appeared to have originated not in that genus, but in the 
genera Phrissura and Belenois. Its adoption by Mylothris, 
which was on all hands admitted to be a distasteful genus, 
Ixxiii] 
seemed to favour the supposition of a Miillerian element in 
this series of resemblances, which interpretation was also 
suggested by the cases of “secondary mimicry” already 
referred to. The striking aposeme, peculiar to African 
butterflies, constituted by dark marginal spots on a pale 
