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Based on the only semi-abundant recent field guide to insects in the region, this should be Eristalis tenax.

But it looks nothing like Eristalis tenaxas I know it, so I'm assuming that some innocent native Eristalinus (or thereabouts) is suffering persecution as an invasive.

Lusaka East, in mango orchard, January 24, 2015.

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Yes, a female Eristalinus sp. In some books indeed depicted as Eristalis tenax, but it's obviously not!