Vv COLOURS OF ANIMALS 385 
Equally remarkable is the increase of size in some islands. 
The small island of Amboina produces larger butterflies than 
any of the much larger islands which surround it. This is 
the case with at least a dozen butterflies belonging to many 
distinct genera, so that it is impossible to attribute the fact 
to other than some local influence. In Celebes, as I have 
elsewhere pointed out,? we have a peculiar form of wing and 
much larger size running through a whole series of distinct 
butterflies ; and this seems to take the place of any speciality 
in colour. 
In a very small collection of insects recently brought from 
Duke-of-York island (situated between New Britain and New 
Treland) are several of remarkably white or pale coloration. 
A species of Euplea is the whitest of all known species of 
that extensive genus ; while a beautiful diurnal moth is much 
whiter than its ally in the larger island of New Guinea. 
There is also a magnificent longicorn beetle almost entirely 
of an ashy white colour. 
From the Fiji islands we have comparatively few butter- 
flies ; but there are several species of Diadema of unusually 
pale colours, some almost white. 
The Philippine islands seem to have the peculiarity of 
developing metallic colours. We find there at least three 
species of Euplea* not closely related, and all of more 
intense metallic lustre than their allies in other islands. : 
Here also we have one of the large yellow Ornithoptere 
(O. magellanus), whose hind wings glow with an intense 
opaline lustre not found in any other species of the entire 
group; and an Adolias® is larger and of more brilliant 
metallic colouring than any other species in the archipelago. 
In these islands also we find the extensive and wonderful 
genus of weevils (Pachyrhynchus), which in their brilliant 
1 Ornithoptera priamus, O. helena, Papilio deiphobus, P. ulysses, P. gam- 
brisius, P. codrus, Iphias leucippe, Euplea prothoé, Hestia idea, Athyma 
jocaste, Diadema pandarus, Nymphalis pyrrhus, N. euryalus, Drusilla jairus. 
2 Contributions to the Theory of Natural Selection, pp. 168-173. 
8 These insects are described and figured in the Proceedings of the Zoolo- 
gical Society for 1877, p. 189. Their names are Euplea browni, Alcides 
aurora, and Batocera browni. : 
4 Euplea hewitsonii, E, diocletiana, E, letifica. 
5 Adolias calliphorus. 
2¢ 
