  We report the discovery of the hottest hybrid B--type pulsator, KIC\,3240411,
that exhibits the period spacing in the low--frequency range. This pattern is
associated with asymptotic properties of high-order gravity (g) modes. Our
seismic modelling made simultaneously with the mode identification shows that
dipole axisymmetric modes best fit the observations. Evolutionary models are
computed with MESA code and pulsational models with the linear non-adiabatic
code employing the traditional approximation to include the effects of
rotation. The problem of mode excitation is discussed. We confirm that
significant modification is indispensable to explain an instability of both
pressure and gravity modes in the observed frequency ranges of KIC\,3240411.
