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At the time of Kessel & Clopton's paper, the only all-black males with clear wings and branched M1+M2 were the various species of Plesioclythia (Posterior crossvein removed from margin by its length or more) and Loew's 'inadequate' description of Platypeza inornata, which they suggested might well belong to Paraplatypeza, as Loew's description did not provide sufficient information to be sure.

So this may be 'Platypeza' inornata

EDIT: Or it may be that my measurements were off, and this is Plesioclythia. Especially seeing as Plesioclythia is widespread across the appropriate regions, and the sole all-black 'Platypeza' seems to be limited to the Eastern Cape.