  The new strange pentaquarks observed by LHCb are very likely hadronic
molecules consisting of $\Xi_c \bar D$ and $\Xi_c \bar D^{*}.$ We discuss the
experimental evidence supporting this conclusion, pointing out the similarities
and differences with the $P_c(4312)$, $P_c(4440)$ and $P_c(4457)$ pentaquarks
in the non-strange sector. The latter clearly are hadronic molecules consisting
of $\Sigma_c \bar D$ and $\Sigma_c \bar D^{*}.$ Following this line of thought,
we predict three additional strange pentaquarks, consisting of $\Xi_c^{\prime}
\bar D$ and $\Xi_c^{\prime} \bar D^{*}.$ The masses of these states are
expected to be shifted upwards by $M(\Xi_c^{\prime})-M(\Xi_c) \approx 110$ MeV
with respect to the corresponding known strange pentaquarks.
