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I'm guessing the only way to separate the species is dissection by an expert or something like that?
Thank you for all your ID's on my hoverflies, a group I'm only beginning to pay attention to.
You don't need to dissect, but you do need a close look at legs eyes and wings with a lens and microscope. Some species/sexes can be done in the field with a lens - if you remember what to look for! - but it is better to take a specimen and do it with a microscope and key.
recording wildlife with The Recorder's Year on www.hbrg.org.uk/TRY.html.
Lat/Lng: 53.7579, -0.6557
OS grid ref: SE887298