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Thanks! Genus is usually enough for me... Unfortunately, I now have two quite different flies filed as possible Promachus, from the same location, so I'm going to have to do something about this...

According to the Biosystematic Database of World Diptera, there are... several species of Afrotropical Promachus... (Madagascar endemics and one species known only from Eritrea not included)...

Promachus abdominalis (Malawi)
Promachus adamsii (Zimbabwe, Kenya, Uganda)
Promachus aequalis (S. A., Kenya, Malawi, Mozambique, Zimbabwe, Tanzania)
Promachus albicinctus (S. A.)
P. apicalis (Zimbabwe)
P. argentipennis (Sudan)
P. aurulans (Tanzania)
P. binucleatus (Ethiopia)
P. bomensis (Congo)
P. bottegoi (Ethiopia)
P. brevipennis (Uganda)
P. breviventris (Kenya, Tanzania)
P. chalcops (Tanzania)
P. cinereus (Zimbabwe)
P. enucleatus (Tanzania)
P. flavopilosus (Malawi, Uganda)
P. floccosus (Nigeria)
P. gossypiatus (Tanzania, Malawi)
P. grisiventris (Sudan, Egypt)
P. hirsutus (Zimbabwe)
P. mediospinosus (Cameroon, Nigeria)
P. negligens (Zimbabwe, Malawi, Tanzania, Zambia)
P. obscuripes (Malawi)
P. pontifex (Tanzania)
P. rapax (Zanzibar)
P. rectangularis (Eritrea, Ethiopia)
P. rex (Tanzania)
P. ruepelli (Ethiopia)
P. reuppelli (Eritrea)
P. rufescens (Sierra Leone)
P. rufihumeralis (South Africa)
P. scalaris (South Africa)
P. simpsoni (Ghana, Nigeria)
P. subtilis (Congo)
P. tewfiki (Egypt, Sudan)
P. tewfikis (Sudan)
P. transvaalensis (South Africa)
P. trichozoans (Benin, Ghana, Guinea, Nigeria, Togo)
P. ugandiensis (Uganda, Malawi)
P. xanthotrichus (Gabon, Angola, Congo, Zimbabwe, South Africa)


Now I just have to eliminate most of those!