The Imperial Bureau of Entomology has recently received from Mr. Ll. Lloyd, Entomologist to the British South Africa Company in Northern Rhodesia, a small Bombyliid fly accompanied by the following letter, dated “Mwengwa, Mumbwa, viâ Broken Hill, N. Rhodesia, November 1, 1913.—I am sending you herewith a specimen of a Dipteron, which I believe to be a parasite of G. morsitans. During July and August of this year I collected about 700 pupae of this Tsetse in nature at Ngoa, in the Mpika Division of Northern Rhodesia. These were kept under observation until September 15th, when I was compelled to travel through fly-free country for a month; they were accordingly closed up in a fly-proof case to avoid escape (in case of possible fracture of one or more of the bottles containing the pupae), and were not examined again until October 18th. On this date one of the bottles, which had contained five Tsetse pupae collected on July 21st, was found to contain:—