Abstract
New experimental measurements are used to test model independent sum rules for charmed baryon masses. Sum rules for medium-strong mass differences are found to be reasonably well satisfied with increasing accuracy, and the new measurements permit an improved prediction of 2778\ifmmode\pm\else\textpm\fi{}9 MeV for the mass of the ${\ensuremath{\Omega}}_{c}^{*0}.$ But an isospin breaking sum rule for the ${\ensuremath{\Sigma}}_{c}$ mass splitting is still in significant disagreement posing a serious problem for the quark model of charmed baryons. Individual ${\ensuremath{\Sigma}}_{c}$ mass splittings are investigated, using the new CLEO measurement of the ${\ensuremath{\Xi}}_{c}^{\ensuremath{'}}$ mass splitting, but the accuracy is not yet sufficient for a good test.
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