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patients brought the Stegomyia fasciata; some must have flownon 
land and inoculated people (1), and then, as the insect can 
not live here, died out, and so the fever ceased. We have seen the 
same in New York, in Philadelphia and even in New Haven and 
Providence. Stegomyia do not breed there, but during the epidemic 
they must have been imported and feasted off the inhabitants' 
blood, and so caused the epidemics, and then died out naturally (2). 
There is, as was pointed out by Sir PATRICK MANSON (1903), a 
very grave danger of yellow fever appearing in the East. We have 
in many or, we may say, most ports the Stegomyia fasciata; it 
only wants the fever introducing, and then 1t would run wild in 
the overcrowded and unsanitary oriental cities, where it could not 
be coped with so easily as in America and the West Indies, for 
one would be dealing with a very different type of people. 
All the more reason therefore for stamping out as far as we can 
this insect wherever it occurs. 
Parasites of Stegomyia fasciata. 
A certain number of parasites have been found on this cosmopo- 
litan insect, but they do not seem to be of any economic import- 
ance. MARCHOUX, SALIMBENI and SIMOND (1903) refer to a kind 
of Mucor occurring in great abundance on this Gnat at certain 
periods of the year (DYÉ). 
The same authors found at Rio de Janeiro certain Myxosporidia 
which they placed in the genus Vosema. 
At Vera Cruz Myxococcidium Stegomyi®e, PARKER, BEYER, 
POTHIER (1903) has been found as a parasite. 
Whilst Low and others of course refer to /ilaria bancrofti in 
this Gnat at Saint-Lucia, Trinidad and on the Niger, but the evo- 
lution is not complete in this Mosquito, and it is difficult to see 
that it can in any way affect the host. 

(1) Most of the cases died on board ship, but some occurred on land and these 
only about 200 yards from the ship which came from the West Indies. 
(2) It has been suggested that the range of this Stegomyza was formerly wider 
than now. There is no evidence whatever to show this, rather the contrary. 
