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Gerard, I had at least one P. peltatus in my garden most of the day yesterday so I got a lot of pics.

I wonder if you could look again at the shape of the swollen section of the tarsus. To me, the shape is quite different to what I see as peltatus. The bottom line of the swollen section in peltatus is a continuous curve, where on my fly it looks to curve upwards in a 'u' shape towards the point. There are other subtle differences too.

As you thought the female Platycheirus I had could be P. nielseni, I wonder if this male could be too. I can't find anything at all about nielseni, not even a drawing of the tarsi.

I now also see that P. amplus has a continuous line at the bottom of the swollen section, and a more blunted point.

I was searching for P. neilseni and found an old thread here, where Andre had suggested either P. amplus or neilseni for a fly which looks to have the same shape tarsus as mine, I think!

http://www.dipter...pid=119033

Once more I am thinking this is :S :o

This pic is of P. peltatus I believe..