1. The genus Didelotia Baill. occurs in W. and Central Africa (Sierra Leone to Congo). Here 8 species are recognized. 2. The monotypic genera Toubaouate Aubrev. et Pellegr. and Zingania Chev. remain incorporated in Didelotia. 3. A new species, D. idae Leon., Old. & de Wit is described. 4. A key to the species is given; they are described, annotated, and illustrated.