Females

1. Prementum of proboscis shining but with a patch of light dust centrally on underside; mid femur with a row of 3–5 hair-like pv–v in basal ½, sometimes one of them stouter ................................. .............................................................................................................. S. platyfrons Sorokina, 2018

¯ Prementum of proboscis completely shining; mid femur with 1 stout pv–v in basal ¼ and 1–2 additional stout or hair-like setae directly at base ............................................................................. 2

2. Notopleuron completely bare; anepisternum with 1 interspatial seta; mid tibia usually with ad; mid femur with 1 stout pv–v in basal ¼ and 1 additional hair-like seta ...... S. nitidicauda (Schnabl, 1911)

¯ Notopleuron with some hairs in upper part; usually anepisternum with 2 interspatial setae, rarely with one; mid tibia without ad; mid femur with 1 long stout pv–v in basal ¼ and 1–2 additional stout or hair-like setae ..................................................................................... S. imitatrix (Malloch, 1921)