I found this site, showing that the color can change easily if they are mating or not so you are right. And the first 2 photos are of a male and the third one of a female (With short antennae). http://www.commanster.eu/commanster/Insects/Flies/SpFlies/Dictenidia.bimaculata.html
From Sweden
http://biodivers.se/files/Dictenidia-bimaculata-380.jpg
http://www.flickr.com/photos/24580998@N08/5700869878/
http://www.flickr.com/photos/24580998@N08/5702460394/
http://liboupat2.free.fr/Insecdiv/Diptere/ctenop_e.html
I have both the male and female, the first 2 photos are from the same individual and the third one is from a different one. Its antennae are a lot shorter.
I can't read German but I google translate it :)
The ID you have suggested looks like it's anterior end is a lot darker than my spotting.
Tipulidae, Dictenidia bimaculata, formerly alo called Tipula bimaculata.
http://en.wikipedia.org/wiki/Dictenidia_bimaculata
Can you read German?
http://de.wikipedia.org/wiki/Dictenidia_bimaculata
Yours is the female.
If I had to guess, I would say that this is a species of Crane Fly, Infraorder Tipulomorpha. I don't have a good reference for European insects though. Perhaps you will be able to get more info with a place to begin.
Hope it helps.
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