misippus that resembles Limnas chrysippus; and the same state- 
ment applies to Papilio dardanus. This latter Butterfly, as is also 
well known, supplies us with another feature in the case. The 
female is polymorphic, and each form of the female is a copy of a 
different Danaine model. I show here a representation of a brood 
of this Papilio, all the specimens being the offspring of a single 
female. The trophonius-form, as we have seen, mimics Limnas 
chrysippus, the hippocoon-form resembles Amauris dominicanus, 
and the cenea-form is in mimetic relation with Amauris echeria 
and Amauris albimaculata. This curious phenomena is by no 
means an isolated case, as is shown by the next illustration. We 
have here the male of the African Pierine Leuceronia argia, in 
which sex the species is practically invariable. But the female 
exists in many different forms, each of which shows a resem- 
blance to a Butterfly of no very close affinity to Leuceronia. The 
mimicked Insects belong to the genera Belenois, Mylothris, Phris- 
sura and Pinacopteryx. 
There are cases on record in which both male and female of a 
sexually dimorphic Butterfly are mimetic, but the respective models 
of the two sexes are different. I do not at the present moment 
recall any instance of a species where the male is a mimic and the 
female not. 
We have then reached this point : that the female sex 1s more 
susceptible to the mimetic influence, whatever it may be, than 
the male. This is shown by the numerous cases of sexual dimor- 
phism in which the female alone mimics, and also by those 
examples of polymorphism, confined to the female, in which each 
separate form assimilates itself to a different model. 
We may now.pass on to another consideration. In all the 
instances that I have shown, the forms that so resemble one 
another are found in the same, or nearly the same, regions and 
localities. In many cases they are observed to have similar habits. 
It has often happened that a group of Insects, diverse in affinity 
but closely allied in aspect, has been taken, not only on the same 
day and within a limited area, but actually on the same plant. The 
illustration now exhibit depicts a wonderful assemblage of 
Insects, all characterised by the same arrangement of colours, 
comprising Wasps, Braconids, Moths, a Bug, a two-winged Fly, and 
Beetles of different families; many members of which assemblage 
I have myself seen settled on or flying about the same tree at 
East London in South Africa. And what is perhaps even more 
remarkable, we find that when geographical races, Or represen- 
