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Well I'm far from expert with these. I have a very simple method how to put the trap. I just watch some days how the flies are flying and put the malaise there. The high end allways to south and that's it :) The two malaise at top are good for Asilidae and Syrphidae for exsample. From the middle ones I got Lauxaniidae, Empididae etc. (And Odiniidae !) The lower left corner is the Tachinidae trap :)

Jari

P.S. Maybe a trapping thread would be interesting :) With Google Earth links too:D