IV 
Preface to Vol II. 
Some one hundred odd new species still remain in the col¬ 
lection to be described; these and new material that continues 
to arrive will be described in a third volume, which it is hoped 
will be produced next year. In the meanwhile I trust corre¬ 
spondents will try and obtain the two sexes of the genera 
Wyeomyici, Brachiomyia and Limaius. 
In a future volume the still unwieldy genus Culex will be 
further reduced, as several species retained in it must be 
excluded on account of scale structure, notably Culex atratus and 
its allies, Culex donalis, Culex sollicitans and several others. 
I take this opportunity of again thanking various corre¬ 
spondents in all parts of the world for the great trouble 
they have taken in collecting material and in helping in every 
way in what has proved a much more arduous task than was 
anticipated. 
Fred. Y. Theobald 
British Museum (Nat. Hist.). 
September 1st , 1901. 
