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Looks like S. melanura to me.

From Pape 1987:

"Male. Frons very broad, 0.26-0.29 x head-width. Thorax with 3 post dc. Legs:mid femur with a complete row of av bristles and an apical row of short pv bristles. Hind trochanter ventro-medially with setae of medium length and a long bristly apical seta. Hind tibia with long hairs on pv and v surfaces.Abdominal T3 without median marginal bristles. Terminalia black. Protandrial segment non-pollinose, or with only traces of pollinosity, and with marginal bristles. Aedeagus with triangular vesical lobes. Harpes reduced to a pair of small forked lobes pointing laterally. Styli rather large and widely separated by the median sclerotisation. Juxta small and weakly sclerotised, almost covering the styli in dried specimens (Fig 253) , but often raised in glycerol preparations (Fig 252)."

You could also try the British key and see if it runs to melanura with that: https://osf.io/vf5r6