  Dwarf spheroidal galaxies are among the most promising targets for detecting
signals of Dark Matter (DM) annihilations. The H.E.S.S. experiment has observed
five of these systems for a total of about 130 hours. The data are re-analyzed
here, and, in the absence of any detected signals, are interpreted in terms of
limits on the DM annihilation cross section. Two scenarios are considered: i)
DM annihilation into mono-energetic gamma-rays and ii) DM in the form of pure
WIMP multiplets that, annihilating into all electroweak bosons, produce a
distinctive gamma-ray spectral shape with a high-energy peak at the DM mass and
a lower-energy continuum. For case i), upper limits at 95\% confidence level of
about $\langle \sigma v \rangle \lesssim 3 \times 10^{-25}$ cm$^3$ s$^{-1}$ are
obtained in the mass range of 400 GeV to 1 TeV. For case ii), the full spectral
shape of the models is used and several excluded regions are identified, but
the thermal masses of the candidates are not robustly ruled out.
