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Hello diptera world!

I found these flies in a wet area by a small lake near my home in Stockholm, Sweden.

From what I've been able to gather by looking around at websites such as this one they should be Dolichopodidae, right?

Are the flies in images 5 and 6 the same species? I just assumed they were the males as they appeared together with the other ones (but in smaller numbers).

Size: 6-7 mm.

Besides (of course) ID I would greatly appreciate any suggestions on literature to help me find out more about flies like these!

1)


2)


3)


4)


5)


6)


Best regards,

John