436 ZOOLOGICAL GEOGRAPHY. [PART III. 
In Buprestide, the principal Austro-Malay genus, Sambus, is 
found here; while Sponsor, a genus 8 species of which inhabit 
Mauritius, has one species here and one in New Guinea. In 
Longicorns there are four peculiar genera, Comusia, Pytholia, 
Bityle, and Ombrosaga ; but the most important features are the 
occurrence of the otherwise purely Indo-Malayan genera Age- 
lasta, Nyctimene, and <Astathes; and of the purely Austro- 
Malayan Arrhenotus, Trysimia, Xenolea, Amblymora, Diallus, 
and Afgocidnus. The remaining genera range over both portions 
of the archipelago. In the extensive family of Curculionide 
we can only notice the elegant genus, Celebia, allied to Hupho- 
lus, which, owing to its abundance and beauty, is a conspicuous 
feature in the entomology of the island. 
Origin of the fauna of Celebes—We have now to consider, 
briefly, what past changes of physical geography are indicated 
by the curious assemblage of facts here adduced. We have 
evidently, in Celebes, a remnant of an exceedingly ancient land, 
which has undergone many and varied revolutions; and the 
stock of ancient forms which it contains must be taken account 
of, when we speculate on the causes that have so curiously 
limited more recent immigrations. Going back to the arrival 
of those genera which are represented in Celebes by peculiar 
species, and taking first the Austro-Malay genera, we find 
. among them such groups as Zonwnas (s.g.), Phlogenas, Leuco- 
treron (s.g.), and T'wracena, which are not found in the Moluccas 
at all; and Myzomela, found in Timor and Banda, but not in 
Ceram or Bouru, which are nearest to Celebes. This, combined 
with the curious absence of so many of the commonest Moluccan 
genera, leads to the conclusion that the Austro-Malay immigra- 
tion took place by way of Timor and the southern part of New 
Guinea. It will be remembered, that to account for the Indo- 
Malayan forms in New Guinea, we suggested an extension of 
that country in a westerly direction just north of Timor. Now 
this is exactly what we require, to account for the stocking 
of Celebes with the Australian forms it possesses. At this time 
Borneo did not approach so near, and it was at a somewhat later 
period that the last great Indo-Malay migration set in; but 
