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Cameron, of certain new species, I think that it will be 
desirable for me to put forth a paper on these insects in 
which I shall endeavour to include the hitherto undescribed 
species, and add such remarks as may seem profitable 
concerning those that have already been described. 
The Hymenopterous fauna of the Hawaiian Archipelago 
is, I believe, a rich one. It held a claim on my entomological 
energies so decidedly second to that of the Coleoptera, that 
I think the fact of its being represented in my collection by 
considerably more than a hundred species, to be very con- 
clusive on the point, that a specialist studying the group 
would reap a great harvest were he to visit the locality. 
I have published (in the Scientific Trails, of the Koyal 
Dublin Socy., 1884, pp. 87 et seq.) some general remarks on 
the climate, &c., of the Hawaiian Islands in their relation 
to the insect fauna to which, I will venture to refer for the 
generalities that might perhaps be looked for as an intro- 
duction to such a paper as the present, merely adding that 
(as far as I can judge) Maui is not, in respect of this group 
of insects, so clearly the metropolis of the island as it is in 
respect of other groups. It has produced, — as will appear 
from what follows, — one or two of the most striking and 
specialized types, it is true ; but, nevertheless, I am inclined 
to think that it must yield to Hawaii the claim to be the 
Hymenopterous centre, as that island has yielded the most 
numerous and most strongly marked forms in every family 
but two: — viz., Apidce and Sphegidce. The species (Pro- 
sopis rugiventris, mihi) of the former, on which this remark 
is founded, very probably is confined to Maui (and the 
closely adjacent island Lanai), while the occurrence there, 
either solely or in much greater numbers than elsewhere, of 
P. Blachhurni, Sm., and P. hilaris, Sm.,- — two of the most 
striking species of the genus, — confirms the probability that 
Maui really is peculiarly rich in these insects. The 
occurrence in very small numbers of Mimesa antennata, 
