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But S. rossica (according to Cerretti's key) would have 3 DC ps. According to that key, if I understand it correctly, the characteristics that would allow it to be distinguished would be:
1. Narrow gena
2. 3 post DC (or 4, with the second one very weak)
3. Prementum as long as or longer than the head
4. T1+2 with mediomarginals
5. Dark brown tegula
5. Black spots around the abdominal setae

I haven't actually consulted any other keys.