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Hi, there's a so-called Life Science Building at the University of Debrecen, by a small forest in a plain area of E-Hungary. This building has it's front wall totally made from a bit darkened glass, and in Summer tousands of flies can be found sitting on the glass. As this Cremifania. Most of them are Fannia, Musca, Sarcophaga, Tachinidae, Lauxaniidae, Lonchaeidae, Sphaeroceridae. BUT there are so many flies therethat statistically you find interesting ones every day. Just this week I found Megamerinidae and this Cremifania. Gabor (Xespok) has already found Simuliidae (a suppposedly mountain family), Chaoboridae (also), Pipunculinae, many Asilids. I also reguilarly find Tabanidae, Empididae, Solva marginata, Keroplatidae, Therevidae, Chyromyidae, Microphor sp, practically every family present in Hungary (except for Thaumaleidae and some very rare families).
The whole buiding acts like a giant Malaise-trap.
At the spot where Cremifania was seen there are many scale insects on Euonymus sp. Maybe it feeds on them?