ii8 FAUNA HAWAIIENSIS 



The Cossonini are the most extensive and important representatives of the Curcu- 

 Honidae. The 46 species of Oodemas and the 10 of Heteramplnis may be at once 

 dismissed as being all indigenous, and the same may be said of the three allied species 

 of Anotheoriis, and the same number of Nesotociis. The 17 species of Dryophthor^is 

 are a varied assemblage and might be distributed in two or three genera, but there is 

 no reason to suppose that any of them will be found elsewhere. The unique example 

 which represents the genus Orothreptes and the hardly less rare species for which we 

 have made the genus Deinocossoniis are almost certainly indigenous, for they are moun- 

 tain forms, attached to indigenous trees. The latter indeed appears to have already 

 formed to some extent distinct races on several of the islands. The species for which 

 the genus Dysomjna is formed must also be considered indigenous, the unique example 

 having been found by sifting dead leaves on the boggy summit of the Kauai mountains. 

 Other two genera now described, each for a single species — Thallatodora and Ha- 

 loxenus — are both found on the coast in logs of driftwood. It is probable that both 

 will be found elsewhere, being natural immigrants. The two species of Pseudolus must 

 both be excluded from the indigenous weevils ; one is found freely in banana and cactus 

 in company with Calandra remota, the other has been found in and near Honolulu only, 

 and on one of these occasions in boards of foreign wood, which formed the floor of a 

 room. The Phloeophagoso7na is abundant in decaying wood oi Aleurites at low eleva- 

 tions, in company with Pentarthrum obsairum, and both these species I have little 

 doubt occur outside the islands. It may be noted that the Aleurites or candle-nut-tree 

 produces but very few indigenous insects, and such as frequent it are mostly poly- 

 phagous species, and although the tree now forms in many localities a large part of the 

 lower forest, I suspect that it has been comparatively but a short time in the islands, 

 and was very probably brought there by the natives when they settled in the country. 

 Another species of Pentarthrum. found on the lowlands near Honolulu must also be 

 considered as foreign. The third species of this genus is very different in appearance 

 and structure to the others, and is truly indigenous, being confined to the mountain 

 forests, where it is attached solely to the tree-ferns, which are so conspicuous a feature 

 of these forests. Thus the species which in my opinion are foreign amount to 13, and 

 are distributed in no less than nine genera, and it may be remarked that those 

 Cossonini, which we consider as foreign, although they have not yet been obtained 

 elsewhere, are all small and obscure insects such as have been little collected in most 

 countries. 



The indigenous Curculionidae on the other hand with their 123 species are distri- 

 buted in 13 genera, which represent three tribes only — Otiorhynchini, Cryptorhynchini, 

 and Cossonini. The genus Rhyncogonus, which was established by Sharp for the 

 members of the first tribe, is not peculiar to the islands, and has since been found in 

 New Zealand and other of the Pacific islands {vide Ent. Mo. Mag. 1899, p. 56). 



The Cryptorhynchini have two genera peculiar, each with only one species 



