There are similar species, this one can be easily identified by the black and yellow legs. The male again, the female has two stripes on the abdomen.
Taken on 23rd July 2007, Lincoln UK.
Taken in 18th July 2007.
Taken on 27th July 2007 on Achillea.
Taken on 13th July 2008. The male, it landed very briefly on a Phlox 'Nicki' flower.