The subject of anti-malarial work in the tropics is one of paramount importance, but I am somewhat diffident in bringing such a subject before the Royal Medico-Psychological Association. However, if not of value, the paper may be of interest.

In dealing with anti-malarial work one can more or less confine one's attention to the anopheline mosquito. It is, however, advisable to deal with other varieties as well, since, though they do not carry malaria, they carry other diseases, for instance Culex fatigans carries filaria, and Stegomyia carries yellow fever. Fortunately, there is very little filaria in Malaya, and no yellow fever; but it has been found that Stegomyia fasciata carries dengue. Also with the opening up of fast new air routes, one has no guarantee that yellow fever will not be introduced into the country, and, seeing the large number of stegomyia there is in Malaya, the result would be disastrous.