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Another interesting discussion! ;)

First, I have to say I disagree with you Ruud on it being L. lutea. Yes they are very variable, I have some which are dark brown and some all yellow, both late in the year! I have checked all of them and none have the pd on t1, that is given in the keys as stated in my earlier post where L. bifurcata does have this pd on t1.

Also, as mossnisse has stated, mine does not have dark verticals, they are pale which can be seen, I lightened a photo to show it better. All my others have black verticals which are very obvious.

The ventral bristles on the middle tibiae you refer to I believe is one near the distal end, as can be seen in the photo in the gallery belonging to Jorge.

http://www.dipter...to_id=1785

This area will be obscured by the hind leg in the upside down photo, the other leg is out of focus. I have marked where it should be on this photo..