see, therefore, that the opinion I have elsewhere
expressed, of the high degree of isolation and the remarkable
distinctive features of this interesting island, is fully borne out by
the examination of this conspicuous family of insects. A single
straggling island with a few small satellites, it is zoologically of
equal importance with extensive groups of islands many times as large
as itself; and standing in the very centre of the archipelago,
surrounded on every side with islets connecting it with the larger
groups, and which seem to afford the greatest facilities for the
migration and intercommunication of their respective productions, it yet
stands out conspicuous with a character of its own in every department
of nature, and presents peculiarities which are, I believe, without a
parallel in any similar locality on the globe.

Briefly to summarize these peculiarities, Celebes possesses three genera
of mammals (out of the very small number which inhabit it) which are of
singular and isolated forms, viz., Cynopithecus, a tailless Ape allied
to the Baboons; Anoa, a straight-horned Antelope of obscure affinities,
but quite unlike anything else in the whole archipelago or in India: and
Babirusa, an altogether abnormal wild Pig. With a rather limited bird
population, Celebes has an immense preponderance of species confined to
it, and has also six remarkable genera (Meropogon, Ceycopsis,
Streptocitta, Enodes, Scissirostrum, and Megacephalon) entirely
restricted to its narrow limits, as well as two others (Prioniturus and
Basilornis) which only range to a single island beyond it.

Mr. Smith's elaborate tables of the distribution of Malayan Hymenoptera
(see "Proc. Linn. Soc." Zool. vol. vii.) show that out of the large
number of 301 species collected in Celebes, 190 (or nearly two-thirds)
are absolutely restricted to it, although Borneo on one side, and the
various islands of the Moluccas on the other, were equally well explored
by me; and no less than twelve of the genera are not found in any other
island of the archipelago. I have shown in the present essay that, in
the Papilionidae, it has far more species of its own than any other
island, and a greater proportion of peculiar species than many of the
large groups of islands in the archipelago--and that it gives to a large
number of the species and varieties which inhabit it, 1st, an increase
of size, and, 2nd, a peculiar modification in the form of the wings,
which stamp