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6 Adolias calliphorus.2cv COLOURS OF ANIMALS 385Equally remarkable is the increase of size in some islands.The small island of Amboina produces larger butterflies thanany of the much larger islands which surround it. This isthe case with at leasta dozen butterflies belonging to many1distinct genera, so that it is impossible to attribute the factto other than some local influence. In Celebes, as I haveelsewhere 2pointed out, we have a peculiar form of wing andmuch larger size running through a whole series of distinctbutterflies ;and this seems to take the place of any specialityin colour.In a very small collection of insects recently brought fromDuke-of-York island (situated between New Britain and NewIreland) are several of remarkably white or pale coloration.A species of Euplsea is the whitest of all known species ofthat 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 entirelyof an ashy white colour. 3From the Fiji islands we have comparatively few butterflies;but there are several species of Diadema of unusuallypale colours, some almost white.The Philippine islands seem to have the peculiarity ofdeveloping metallic colours. We find there at least threespecies of Euplsea 4 not closely related, and all of moreintense metallic lustre than their allies in other islands.Here also we have one of the large yellow Ornithopterse(0. magellanus), whose hind wings glow with an intenseopaline lustre not found in any other species of the entiregroup; and an Adolias 5 is larger and of more brilliantmetallic colouring than any other species in the archipelago.In these islands also we find the extensive and wonderfulgenus of weevils (Pachyrhynchus),which in their brilliant1 Ornithoptera priamus, 0. Helena, Papilio deiphobus, P. ulysses, P. gambrisius,P. codrus, Iphias leucippe, Euplaea prothoe, Hestia idea, Athymajocaste, Diadema pandarus, Nymphalis pyrrhus, N. euryalus, Brasilia jairus.3 Contributions to the Theory of Natural Selection, pp. 168-173.3 These insects are described and figured in the Proceedings of the ZoologicalSociety for 1877, p. 139. Their names are Euplsea browni, Alcidesaurora, and Batocera browni.4 Euplsea hewitsonii, E. diocletiana, E. Isetifica.