X, B, 3 Barber et al.: Malaria in the Philippines 1938 
houses (Bugsanga barrio, San Jose), but the larve of this species 
were so few in that locality that no trustworthy deductions can 
be made. 
Some definite data regarding the lurking places of anopheles, 
other than houses, were obtained at San Jose, Mindoro, by a 
study of A. febrifer. A clear brook flowing through woods near 
Magbando barrio contained numerous larve of A. febrifer, but 
comparatively few of any other species of mosquito. A search 
was made for hiding imagoes in the numerous crab holes and 
in the matted tree roots along this brook. Smoke was blown 
through a tube into these holes and roots, and the mosquitoes, 
on being driven out, were caught in a large glass funnel having 
the neck plugged with cotton. The bottom of the funnel was 
quickly covered with a large piece of pasteboard, and the mos- 
quitoes, stupefied by means of tobacco smoke, were blown into the 
neck of the funnel. They could then readily be removed to vials. 
Numerous specimens of culex were found in these lurking places, 
but only 2 of A. febrifer, although the larve of the former were 
few and of the latter many. Both specimens of A. febrifer were 
females. One was caught in a crab hole but half a meter from 
a much frequented spring. The other, caught in matted roots, 
contained about 70 nearly mature ova. No malarial parasites 
were found in either on dissection. Magbando barrio (see 
Table I), where 34 specimens of A. febrifer were caught in 
houses, is located only a few rods from the bank where the 2 speci- 
mens of A. febrifer were caught in the crab hole and in roots. 
A careful search for mosquito imagoes was made in Bioos, 
Negros Island, along the banks of a jungly brook, which con- 
tained very numerous larve of A. febrifer. Banks deeply cov- 
ered by overhanging vegetation, crab holes, hollow logs, and 
vegetation of various sorts were “smoked,” but very few mos- 
quitoes of any kind were found and none that could be identified 
as anopheles. Other species of anopheles, A. rossi and A. barbi- 
rostris, were breeding in this brook. Dwellings and the shelters 
of sheep, horses, and pigs located near the brook were searched 
at daylight and at various times during the day with negative 
results. No signs were observed of anopheles flying at daylight 
to or from the brook or buildings. At that time only a moderate 
amount of malaria existed among the people living on the coconut 
plantation bordering this brook, but it is said to have been much 
more prevalent there before the jungle was cleared away. 
Enemies of mosquitoes—myriads of ants and many spider 
webs—were abundant along the banks of this brook. However, 
in view of the multitudinous lurking places which a jungle offers, 
133057——2 
