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Any tips on which parts need to be photographed please?
For identifying Syrphus to species, you need to establish via the photograph the colour of the hind femora, the hairiness or otherwise of the eyes and the presence of microtrichia (microscopic hairs) on the basal cells of the wings.
In other words...you cannot really ID them by most photos! :)
My Flickr photos...
Lat/Lng: 52.7, -0.4
OS grid ref: TF1119