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Archived issues of African Invertebrates (formely Annals of the Natal Museum ) and a few other journals are now freely available at

http://www.ajarch...

All very searchable. A few examples --

D. J. Greathead1 and N. L. Evenhuis 2001

Annotated keys to the genera of African Bombylioidea (Diptera:
Bombyliidae; Mythicomyiidae

Harold Oldroyd 1974
An Introduction to the Robber Flies (Diptera: Asilidae)
of Southern Africa


Jason G. H.Londt 2002
Afrotropical Asilinae (Asilidae): A provisional key to genera ...


Many others - a fantastic African Diptera resource :)

Edit 10/10/15: Hyperlink updated