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According to available sources, a single species has been recorded from Namibia so far (doesn't mean much for Africa, I'm afraid), Dihybocercus nigra Ross, 1955 (Embiidae). The species from this genus are apparently more brightly-coloured, sometimes looking much like Paederus rove beetles (Annu. Rev. Entomol. 2009: 54, p. 14, Fig. 15). Maybe nigra is, well, nigra.
Just in case, the genus diagnosis (males) from Davis, 1939: Winged, R4+5 forked, M simple, cubitus 3-branched, the two lateral branches arising anteriorly from the stem, pectinate. First segment of hind tarsi with two large ventral bladders. Tenth abdominal tergite completely cleft; process of left hemitergite complex, with a flat latero-dorsal lobe. First segment of left cercus with inner margin produced in two lobes, both bearing numerous small teeth.