Published online by Cambridge University Press: 10 July 2009
Two areas in Ankole, Uganda, were studied with a view to obtaining estimates of the standard availability of Glossina morsitans Westw. These estimates gave maximum and minimum fiducial limits of 2·0 and 0·19 per cent. These are considerably lower than the estimates, obtained by Jackson in Tanganyika, of approximately 10 per cent. This difference is of practical importance in that a single fly caught in Ankole indicates a much larger population, and this is the probable explanation of the trypanosomiasis problem round the edges of the flybelt, where routine catches showed flies to be scarce.