S193: another non-eclipsing SW Sex star

We present time-resolved optical spectroscopy of the cataclysmic variable S 193. The emission lines are remarkably similar to those of V795 Her and exh ibit high-velocity S-waves and complex absorptions that are modulated with the orbital period. Evidence for transient anomalous spectral features is s een during the first two nights of our run. We propose that S193 and V795 H er are non-eclipsing SW Sex stars. Finally, we show that the 'disc overflow ' model fails to explain the Balmer line orbital behaviour in these low-inc lination systems.