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Hello,

I guess that it is always Lonchaeidae. Maybe not yet fully grown up (Pic 3,4) or uncoloured (Pic 5,6). Perhaps different species? Fly Pic. 5,6 a male animal?
All flies were found in the same place.
Location: Northwest-Germany, wet Meadow, small stream with deciduous trees, size about 5 mm, photes from 03. and 07. May 2018,

Greetings, Konrad