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Hi, yesterday I've found my first Bibio leucopterus in the garden on a daisy.
Determined by the Verbeke-key (hopefully correct):

8-9 mm, wing-membrane heavily smoky - appear brownish to blackish;
Veins also strongly pigmented...
crossvein r-m slightly longer than basal radial vein R_2-5.

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Body, legs completely black with short black hairs, hairs of abdomen dorsally whithish.
Spurs on tibia I nearly same length.

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Eyes naked, elongated oval, interocular area dull, not pilose.

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Yes, it is a paradox, female leucopterus has actually black wings ...


Theo