CLOSED: I think this is Dilophus febrilis..

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bonitin Gent, Belgium(Zone 8a) Apr 29, 2008

Probably a female ? Picture taken some days ago in a lawn..

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bonitin Gent, Belgium(Zone 8a) Apr 29, 2008

another angle;

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bonitin Gent, Belgium(Zone 8a) Apr 29, 2008

I compared with;
http://images.google.be/imgres?imgurl=http://www.diptera.info/images/photoalbum/album_4/3659-dip-bibionidae-dilophus-febrilis-female-hemmerich-010906_t1.jpg&imgrefurl=http://www.diptera.info/photogallery.php%3Falbum_id%3D4&h=80&w=120&sz=3&hl=en&start=7&tbnid=sYY-vSfBplAPqM:&tbnh=59&tbnw=88&prev=/images%3Fq%3Ddilophus%2Bfebrilis%26gbv%3D2%26hl%3Den%26sa%3DG

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wallaby1 Lincoln, United Kingdom(Zone 8a) Apr 29, 2008

I would say it's a female Bibio marci. The male has larger eyes, and a narrower abdomen.

http://www.diptera.info/photogallery.php?photo_id=912

The female Dilophus febrilis has an extra shield behind the head and only one set of 'antennae' or whatever they may be, and you already have the male Bibio marci I think.

http://www.diptera.info/photogallery.php?photo_id=914

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bonitin Gent, Belgium(Zone 8a) Apr 30, 2008

I see, I had overlooked the extra shield and the antennae difference, but they are very much look-a-likes. I didn't think it could be the Biblio marci as the heads of male and female are so different!

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