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Just be aware that Eristalis only has the one 'r' and that the species name should not have a capital letter.
Ideally, you want to see the rows of hairs down the eye and the dark hind tibia, with fringes of long hairs, to be certain of tenax.
My Flickr photos...
Thanks Ian, I will check the other photographs and try and get the spelling correct; old habit to put capitals to start names.
Lat/Lng: 50.72012, -1.84852
OS grid ref: SZ107911