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Rhagoletis sp.
I am pretty sure that is some sort of deer fly. PS they are fast and bite hard.
I'm more inclined towards the family Tephritidae - the fruit flies, which the SA Insect Field Guide (Picker, Griffiths & Weaving) says is "easily recognizable by the elongate and pointed ovipositor of the female and the patterned wings of many species"