An annotated list is presented o( 114 spp and sspp. (some identified to the genus only), deposited in the Rijksmuscum van Natuurlijke Historic. Leiden, and collected during 1962-197.1 at 51 localities; the bulk originating from the eastern shore of Lake Tanganyika. I he genus Notogomphus Hag. requires a revision. Specimens of Trithemis dorsalis (Ramb.) show througout the trithemine condition of the last ante-nodal cross vein rather than that of Helothemis Karsch. A ga/eteer is also provided.