New data on the distribution of the proctotrupid genus Exallonyx in South Africa are provided. One new species, E. townesi Kolyada, is described from the Western Cape and KwaZulu-Natal provinces. E. cingulatus Townes, 1981 is synonymised with E. leptocorsa Townes, 1981. A key is provided to the four species of Exallonyx recorded from South Africa.

To cite this paper: Kolyada, V.A., Mostovski, M.B. & Brothers, D.J. 2004. New data on proctotrupid wasp genus Exallonyx Kieffer (Hymenoptera: Proctotrupidae) from South Africa, with description of a new species and new synonomy. African Invertebrates 45: 237-248.