Introduction. Vil 
Considerable advance has been made in the North and 
Central African Culicidae through the work and courtesy of 
Drs. Sergent and Billet, who have sent in valuable material 
from Algeria and the Sahara region. Major Ronald Ross, C.B., 
Capt. Lyle Cummins, R.A.M.C., Dr. Keatinge, and others have 
also sent Egyptian material. 
We still lack specimens from the Pacific coast of North and 
South America, from the East Indies, and from many of our 
oceanic islands. lLieut.-Col. David Bruce, F.R.S., R.A.M.C., has 
obtained interesting collections through the medium of the Army 
Medical Department. 3 
Most unsatisfactory of all are the European species. A great 
number have been described, many of which are probably the 
same species. Very little European material has been examined ; 
but when any fresh material is forwarded, it is usually composed 
of one or two common species. 
Some advance has been made in connection with the Hast 
Indian Anopheles by Dr. Donitz, who has recently issued a paper 
deseribing eight new Anopheles, several of which cannot, however, 
be considered valid species. The material seems to have been 
mainly preserved in spirit. 
I must here express my thanks to the many correspondents in 
all parts of the world of many nationalities for the help they 
continue to give in connection with this work. 
To Professor Blanchard I am greatly indebted for helping me 
in the nomenclature. 
The illustrations have been prepared as before with great 
care by Miss C. Beard and Mr. W. H. Hammond. 
FrepD. V. THEOBALD. 
April 4th, 1903. 
