Abstract
In the British Museum (Natural History) Ruwenzori Expedition 1934–35 vol. II nos. 3 (1939) and 4 (1940) generic keys to the Muscinae and Coenosiinae and specific keys to Graphomyia, Musca and the Coenosiinae of the Ethiopian region have been published. As there seems no possibility of the Museum issuing any more of these reports in the near future, it has been agreed that suitable extracts from the manuscript of the third part be published in this Journal, so that the keys and some other necessary data shall be available for the use of Entomologists in Africa.