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I am trying to make a list of the fauna near a small natural stream called l'eau noir (Black water) near Avenches in Switzerland at 430m of altitude. I am by far not a specialist of the diptera species, and do the classification, by comparing the pictures from specialized sites. Unfortunately there are many species that look similar with minimal differences and other that I am not able to find. Hope is ok if I ask for identifications, and apologize in advance for the poor quality of some pictures.

Date: 30 July 2016, near stream 430m Switzerland