What were those fabulous fly fails?
Sarcophagidae (a flesh fly)
Ichneumonidae (a parasitic wasp)
Asilidae (a robber fly)
Chironomidae (a midge)
The order of fail, from least to most, is 4, (1,3 tied), 2.
Points are awarded as follows. 8 to Chris Grinter for the identifications, and 2 to Gunnar for being the the first to correctly pick the ranking.
The rank question is essentially about the fly phylogeny and how to read it, and the secret was to know that the robber fly and the flesh fly are both equally distant from a mosquito.