In the autumn of 1928 Dr. J. Schwetz forwarded to the writer, from Stanleyville, a small collection of blood-sucking Diptera, the majority of which had been obtained by him in the region of the Lower Lomami River. The material sent included specimens of four species of Glossina, the determination of three of which (G. palpalis, Rob.-Desv., G. fusca, Walk., and G. tabaniformis, Westw.) presented no difficulty. The fourth species, however, which had evidently attracted the special attention of the sender, since specimens of it were received labelled “ ? G. pallicera,” proves to be new and is accordingly described below. Dr. Schwetz, who is already well known by reason of entomological investigations in Belgian Congo extending over a long series of years, is to be congratulated upon a discovery which brings the number of recognised species of Glossina up to twenty.