  We present the results of a survey of the Coma Berenices open star cluster
(Melotte 111), undertaken using proper motions from the USNO-B1.0 and
photometry from the 2MASS Point Source catalogues. We have identified 60 new
candidate members with masses in the range 1.007<M<$0.269M_solar. For each we
have estimated a membership probability by extracting control clusters from the
proper motion vector diagram. All 60 are found to have greater than 60 per cent
probability of being clusters more than doubling the number of known cluster
members. The new luminosity function for the cluster peaks at bright
magnitudes, but is rising at K~12, indicating that it is likely lower mass
members may exist. The mass function also supports this hypothesis.
