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Belated update: found Ricardo's 1920 paper on Promachus (Annals & Magazine of Natural History, series 9, vol 5), from which this should be P. xanthotrichus.

Because of its date of publication, this does not rule out: P. aurulans (Tanzania); P. bomensis or P. subtilis (Congo); P. cinereus or P. hirsutus (both Zimbabwe); P rufihumeralis or P. transvaalensis (South Africa).

Will update again one the original sources for these have been located...