THE YELLOW-FEVER MOSQUITO. 
(Aedes calopus Meig.) 
HOW TO RECOGNIZE THE YELLOW-FEVER MOSQUITO. 
The only species of mosquito which has been shown to transmit 
yellow fever is a small form well known in the Tropics. It is some- 
what variable in size, 
but on the whole is so 
small as to require a mos- 
quito bar of 20 strands, 
or 19 meshes, to the inch 
to prevent its entrance 
to screened rooms. Both 
males and females can 
pass through a netting 
containing 16 strands, or 
15 meshes, to the inch. 
Tt is.a strikingly marked, 
and, on the whole, when 
seen under the lens, a 
beautiful insect. Its gen- 
eral color is dark, but 
its thorax is marked with 
a silvery white, lyre- 
shaped pattern; the ab- 
domen is banded with 
silvery white, and there 
is a silvery white spot on 
each side of the abdomi- 
nal segments. The legs 
are banded alternately 
with black and pure 
white, and the long palpi 
“>? 
Fig, 1.—The yellow-fever mosquito (Aedes ‘calopus) : 
Adult female. Much enlarged. (Original.) 
of the male are also alternately banded with black and pure white. 
As with many other species of mosquito, the antenne of the male 
95616°—Bull, 547——13 
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