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Ooops! Thanks to Gerard for preventing any further embarassment! :|
Reading up on this family, it looks like this is Sphecomyiella valida. It's certainly not the same species as that identified as Pyrgota (formerly Boreothrinax) maculipennis, which has a completely different hind tibia shape. Astonishing life history - oviposition in scarabeid hosts while in flight (at night), and larva completes its development in two weeks. :o