It is a shame that this hoverfly left its leaf before I could get a good photograph of it! However, the photograph is good enough to show the glaucous colouring on the abdomen and thorax which makes it almost unmistakable; Leucozona glauca - named after its blue/grey or glaucous colouring. The female has this more of this distinctive colouring than the male.
In Dorset it is almost at the edge of its range being predominantly a western and northern species where it is very common. It is generally considered to be a woodland species thriving where umbel flowers can be found along woodland edges and rides. My record from Garston Wood would seem to be the prime habitat for it.
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