140 MESSRS. SALVIN AND GODMAN ON [Feb. 20, 
to this he has since made some additions (P. Z.S. 1875, p. 610). 
In this list he includes the species mentioned by Montrouzier in his 
article on the Butterflies of Woodlark Island, and also the few in- 
cluded in ‘The Entomology of the Voyage of the ‘Coquille,’’ from 
New Ireland. But Woodlark Island is very properly included in 
the Papuan fauna by Mr. Wallace; and New Ireland also belongs to 
the same fauna, as seems evident from the present collection. 
At least 27 species are included in Mr. Butler’s list from these 
localities ; and deducting them from the total of 104 species, we have 
77 as the number of species at present known to inhabit the South- 
Sea Islands beyond the immediate influence of New Guinea. To 
these must be added the 23 additional species mentioned in Mr. 
Butler’s second paper, making a total of 100. Very much remains 
to be done before any thing like a complete knowledge of the Butter- 
flies of the South-Sea Islands is acquired; but it would seem that 
these islands can hardly fail to present a comparatively poor Lepi- 
dopterous fauna; and, judged by this standard, New Britain and the 
adjoining islands certainly cling to the richer fauna of New Guinea. 
Of the genera in the present collection not found in the South- 
Sea Islands proper, we have Cynthia, Rhinopalpa, Cethosia, Cyrestes, 
Minetra, Pithecops, and Ornithoptera; whilst, of the remainder, 
Drusilla is a very characteristic New-Guinea form, represented in 
Otaheite by a single species, and the rest are all more or less widely 
ranging genera. 
It is unfortunate that in making this collection Mr. Brown has 
not noted the particular island where each specimen was captured. 
The presence in it of two such distinct species of Ornithoptera as 
O. aruana and O. urvilliana is suggestive; and it seems very 
probable that the former was obtained in New Britain and the latter 
in New Ireland. As O. aruana has a very wide range, and the latter, 
as far as we yet know, an extremely limited one, it seems quite 
possible that the faunze of these two islands may differ more inter se 
than might be expected from the proximity of the two shores. We 
hope that Mr. Brown will be able to clear up this point, as it is one 
well worthy of investigation. 
A considerable number of the species in the present collection 
differ in a slight degree from their representatives from Western New 
Guinea and the adjoining islands. This is hardly surprising, seeing 
the wide interval of several hundred miles which intervenes between 
New Britain and the point previously investigated. Some of these 
races we have described in the present paper; others we leave until 
the receipt of additional specimens shows more clearly the extent to 
which they differ. 
The nearest point to New Britain which has had its Butterflies 
examined is Woodlark Island. This island is situated on the north 
side of the Louisiade archipelago, in about 9° S. lat., and 153° E. 
long. It remained undiscovered until 1836, but has since been 
visited by French missionaries, one of whom, M. Montrouzier, 
having made a small collection of Butterflies, described them in 
1856 in the ‘ Annales des Sciences Phys. et Nat. de Lyon,’ Unfor- 
