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Hello,
Blossom of Echinocystis lobata (Cucurbitaceae) attracts many small insects. I watched lots of bibionids, females more than males, that fed on the flowers. When the flowers withered within a week after my arrival, the ground was covered with dead flies. I suppose them to be Dilophus febrilis.
Locality is the Island of Usedom in August. Echinocystis is, however, a frequently grown ornamental climber, nothing special for that region.
Regards, Sundew

Here is the female.

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Here comes the male.

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The female is Dilophus febrilis (the only species you might expect with darkened wings) and if the male belongs to the same species, well, then you know the answer. ;)

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Your guess seems correct.

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Well, the male said he had no choice, there were no other Bibionid girls on that Echinocystis hedge :D! I only know that Dilophus febrilis males have colourless wings and hairy eyes (which fits my pics), and that the two sexes that crowded the inflorescences would give nice couples, even if I did not see mating. So I postulate it's the same species.
Thanks to the helpful team of the Netherlands!
Sundew

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Oups!
http://www.ethnoplants.com/culture%20de%20l'Echinocystis%20lobata.html:o

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Where is the problem? In Germany, the annual Prickly Cucumber is a popular ornamental climber because of its rich blossom and the funny fruits. It is poisonous like other members of the Cucurbitaceae family, e.g., the two species of Bryonia that are native to Germany. There are, however, lots of poisonous ornamental plants; they are not dangerous but lovely to those who know how to treat them the right way! (The insects certainly belong to these folks...)
Cordially, Sundew