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This is Craticulina spec indeed. From Tanzania only Craticulina seriata is known so far.

Identification key: Zumpt, 1961, Calliphoridae (Diptera Cyclorrhapha) part III Miltogramminae.

Wasp larvae emerge later than larvae of miltogrammine fly. The fly is (ovo)larviparous, which means that the fly does not lay eggs, but larvae. The fly larvae eats the prey of the sand wasp leaving little to eat for the wasp larvae. Sometimes they also attack the smaller wasp larvae itself.

Liekele