Mosquitoes of Nissan Island — LAIRD 
155 
Allied military occupation included weekly 
larvicidal treatment of all ground pools with- 
in the camp areas. Over the latter (and major) 
part of the period, 5 per cent DDT in Diesel 
oil was used for this purpose. From the fact 
that the pools examined in the present survey 
already supported thriving populations of 
various arthropods two months after the ces- 
sation of mosquito control activities, it is 
apparent that the residual effect of this treat- 
ment was short-lived. This was probably 
largely due to tropical downpours flushing 
away the DDT-Diesel oil emulsion from the 
pools. The rapidity with which Anopheles may 
reoccupy an area from which it has been 
temporarily excluded by control measures is 
well illustrated by the fact that all suitable 
larval habitats for Anopheles farauti in the old 
camp areas held heavy populations of this 
species when the survey was conducted. It 
may be that the presence of such large num- 
bers of anopheline larvae (average: 75 per 
square foot of water surface) represented a 
temporary population peak made possible by 
the fact that the normal biological balance 
between A. farauti and its natural enemies had 
not yet been restored, because of the longer 
time required for the rebuilding of sufficiently 
heavy populations of such predators as 
Zygoptera, Coleoptera, and Gerridae to keep 
breeding of the anopheline in check. 
The following mosquitoes are recorded 
from Nissan Island for the first time: Aides 
{Stegomyia) quasiscutellaris Farner and Bohart, 
Aides {Aides) carmenti Edwards, Armigeres 
hreinli (Taylor), and Culex {Culex) annuliros- 
tris Skuse. 
Of the seven species of mosquitoes now 
known from Nissan, four are common to the 
Solomon Islands and the Bismarck Archi- 
pelago, one is indigenous, and two are other- 
wise restricted to the Solomons and the Bis- 
marck Archipelago respectively. 
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