32 
the breeding places of the Stegomyia. It is only when one attempts 
to fight this mosquito that a comprehension of the difficulties to be 
surmounted is really gained. 
Stegomyia calopus is essentially a house mosquito. The female is 
not a ‘ rover ’ and keeps to a small area provided that she can obtain 
blood. She will lay her eggs in all kinds of receptacles capable of 
holding water, in fact, she often appears to choose the most unlikely 
places. The larvae and nymphae require a very' small quantity of 
water and appear to be far more hardy' than many of the other 
Culicinae. 
The average dwelling-house or office in Manaos affords the 
Stegomyia an excellent propagating place receptacles containing 
water abound in the houses and backyards, underneath the floors, 
and in the various other places which we have already enumerated 
The climatic conditions of Manaos are ideal for the breeding of the 
mosquito. There is plenty of rain, the humidity is considerable, the 
temperature is suitable, the breeding spots are ready', yui oi tnese 
conditions are present throughout the year. Certain months are 
especially favourable for the development of the young, viz,: 
September to January. 
For the propagation of the disease there are numerous female 
Stegomyia all prepared to feed on a yellow fever patient. The 
°®° rt ™ ltie ' . for . doin £ 50 are numerous, as the class mostly 
aflheted by this disease are careless in the use of the mosquito net. 
there is a net it may be torn or, more probably, it will not be used 
sZf / T been 50 ° ften verified ' * “ ‘he young female 
dShe 7 T A raVen ° US f ° r f °° d ’ fli “ "bout L bites 
during the day tune. Hereafter she is more cautious and will bide 
o e At7 h r t0bite dUrmg “ le ^nce -c! 
any non-immune who lives mrtie city 'p'^ ^ ^ dangerous for 
or sleeps without a mosquito net. OPer “ “ mlscreened house 
for the development ^f The ^ycle Athe’" ,emperatUrC 15 ret > aisi,e 
tenance of the virulence of the virus Th !" 0SqUlt0 - and the mam - 
this, as the preponderance of 16 C imate of Manaos favours 
after the four hT 7 ZyZT ^ ^ ^ <™ d ” * 
Yellow fever can occur at al times of th 
s Of the year; usually the 
