PREFACE. 
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Owine to the large number of collections of Culicidae received at 
the Museum since the appearance of the first two volumes of this 
monograph in November, 1901, and the frequent enquiries for 
the names of the mosquitoes sent by medical men, the Trustees 
have decided to issue a further volume of this work. 
Between April, 1901, and February, 1903, over a hundred 
collections have been received. Many of these are of considerable 
extent, but were found to contain much material that had been 
previously described. Amongst them, however, were eighty-eight 
new species, eight new varieties, and several species of which one 
sex only had been described. Several old species that have not 
been recorded since the original descriptions were drawn up have 
also been re-described from this fresh material, and a few species 
described by cther authors are also incorporated so as to make 
the work complete. 
Since the last recorded collection (p. 352) was received, about 
twenty-five further consignments have arrived, which also con- 
tain many new species. These will be described in Journals, as 
it is not proposed to issue another volume until the arrival of 
new species considerably slackens and the subject has reached a 
more final stage. Coloured plates have been dispensed with, and 
I have confined the illustration to the text and collotype plates 
of the wings and scales. 
This group has yet a further importance attached to it than 
when the first volumes went to press, owing to the proved con- 
nection between the genus Stegomyia described in Vol. I., p. 283, 
and Yellow Fever. 
Bearing in mind the not far distant opening of the Panama 
