The following information in regard to the distribution of malaria in South Africa has been compiled chiefly from the reports of Government Medical Officers and Health Officials who were circularised by courtesy of the Union Public Health Department in March, 1918, in regard to the following points:

(1) The areas affected in each district.

(2) The type or types of malaria existing.

(3) The incidence of the disease, whether endemic or epidemic; and

(4) The types of anopheline mosquitoes identified.

The information available from these sources indicates the necessity for a considerable amount of further work to provide a more complete and accurate knowledge of the incidence of malaria in South Africa.