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Well, I think there is hardly anything in common with these families with respect to observability: you can catch pipunculids here and there quite evenly during the main collecting season (at least here in the north).

On the other hand - Acroceridae is a really elusive group, in Finland we got a new generation of dipterists really starting to do field work in the turn of the millennium, but it was not until the latter part of this decade, when any of us had caught a single specimen of that small family!

Are acrocerids more common in the southern regions?