Contributions to the theory of natural selection. A series of essays ... By Alfred Russel Wallace ...

192 THE MIALAYAN PAPILIONIDAE AS
are either almost or entirely restricted to one portion
of the archipelago:Indo-Malayan Region. Austro-McMlayan Region.
Nox-group. Priamus-group.
Coon-group. Ulysses-group.
Macareus-group (nearly). Erechtheus-group.
Paradoxa-group.
Dissimilis-group (nearly).
Brookeanus-group.
LrEPTOCIRCUS (genus).
The remaining groups, which range over the whole
archipelago, are, in many cases, insects of very powerful flight, or they frequent open places and the seabeach, and are thus more likely to get blown from
island to island. The fact that three such characteristic groups as those of Priamus, Ulysses, and Erechtheus are strictly limited to the Australian region of
the archipelago, while five other groups are with equal
strictness confined to the Indian region, is a strong
corroboration of that division which has been founded
almost entirely on the distribution of Mammalia and
Birds.
If the various 3Malayan islands have undergone
recent changes of level, and if any of theim have been
more closely united within the period of existing
species than they are now, we may expect to find
indications of such changes in community of species
between islands now widely separated; while those
islands which have long remained isolated would have
had time to acquire peculiar forms by a slow and
natural process of modification.