M.Sc. (Zoology) / This investigation is the first systematic survey of the cestodes of some Muridae and some Cricetidae in the Republic of South Africa. Previous records of these parasites in the Ethiopian Region form part of reports on the helminthfaunae of various countries. The cestodes which have been recorded from Myomorpha in the Ethiopian Region are summarized in Table 1. Some of the cestodes recovered in this survey have a cosmopolitan distribution and have been recorded from many species of rodents in various parts of the world. It is not possible or relevant to include all these records in the list of definitive hosts which therefore only include those hosts recorded in this survey. The foilowing authors were consulted to verify the correct names of the host animals: Allen (1939), Cabrera (1960), Davis (1968), De Graaff (1968), Ellerman & Morrison-Scott (1951), Missone (1968) and Troughton (1941). In the text the current names of African states are used instead of those mentioned in the literature. They are: Congo (Democratic Republic)- Belgian Congo Rhodesia- Southern Rhodesia Somalia- Italian Somaliland Tanzania- Tanganyika Zambia- Northern Rhodesia In listing the localities in the Republic of South Africa the various provinces are abbreviated as follows: E.P. - Eastern Province (Cape Province) W.P.- Western Province (Cape Province) N.W.P. -North Western Cape (Cape Province) Ntl.- Natal O.F.S.- Orange Free State Tvl.- Transvaal…