The photo of the fly as a newly emerged adult next to its pupal case also shows the entrance to the Xylocopa caffra nest which the robber fly had parasatized.

Hyperechia sp. "Carpenter Bee Robber Fly" which mimics, parasitizes, & preys on Carpenter Bees (adults are reported to also prey on other bees & wasps)

Hyperechia cf. marshalli

Massive fly, seemed to be well over 40mm; railing should be around 60mm, wasp around 15-20mm.