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Thanks a lot Chris,

I've just checked what on Earth that katepisternum is (with Syrphidae as an example, http://home.hccnet.nl/mp.van.veen/KEYS/bodypart.htm) and there's more lateral views available, so maybe I'll post an additional image when I'm (finally) home.

Regarding small size, now I remember recent discussion here about Tachinidae spp. size variations, yet I presume that flies of the mentioned genae are typically/invariably small...