Pome hey ie i oe 
sura, not very nearly allied to one another, but exhibiting in many 
of their species, or geographical races, a curious parallelism. 
Nearly every form of My/othris has its own copy among the forms 
of Phrissura; and exactly as in the instance of the South American 
assemblage we have just been examining, the changes observed in 
passing from one portion of the African continent to another are 
alike in the corresponding forms of the two genera. Thus, as is 
shown by these lantern illustrations, Mvlothris narcissus is asso- 
ciated in East Africa with Phrissura lasti, both being Butterflies 
with lemon-yellow hindwings and black marginal spots. A form of 
Mylothris from Uganda, white with a dark apex to the forewing, a 
row of dark marginal spots on the hindwing, and a basal patch of 
bright orange on the forewing,isaccompanied bya form of Phrissura 
(P. sylvia) showing the same characters of colour and pattern. In 
the Congo region we find a form of Mylothris (M. asphodelus) 
similar to that just mentioned, except that in the basal patch the 
orange is replaced by lemon-yellow; and from the same region 
comes Phrissura perlucens, in which exactly the same change has 
taken place. Tropical West Africa has a form of Mylothris (M. ber- 
nice) in which the patch of basal orange takes on a darker tinge 
and is somewhat modified in shape. In both these respects the 
Mylothris is followed by a form of Phrissura found in the same 
locality. Lastly, there are parallel pairs of the same genera, 
inhabiting respectively the same localities, which show a curious 
barring or striping of the marginal area, accompanied in one 
instance by a brown coloration of the forewing, affecting the 
representatives of both genera. 
These instances — and it would be easy to multiply them — 
derive their principal interest from the special resemblances, often, 
to our view, minute, which obtain between pairs or assemblages of 
different species, and which change in an identical manner when 
we pass from one locality to another. 
Taking a more general view, we cannot avoid noticing that 
certain distinct systems of colouring are broadly characteristic, 
though with modifications, of certain definite large areas of the 
earth’s surface. Anyone, for example, seeing a Butterfly with a 
uniformly dark coloration, the forewing being crossed diagonally 
by a crimson band (as in the representations here shown of a Æeli- 
conus, H. guaricus, and two Pierines, Pereute leucodrosime and 
P. charops) would in near y every case be right if be pronounced 
them to be natives of the Neotropical Province, that is to say, of 
Central or South America. So too, the general aspect of Mylothris 
