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Background  Centrosaurine ceratopsids are well known from the middle Campanian Upper Two Medicine Formation of Montana. Four taxa have been named:  Brachyceratops montanensis ,  Rubeosaurus ovatus ,  Einiosaurus procurvicornis , and  Achelousaurus horneri .  Rubeosaurus  has been historically the most enigmatic of these taxa; only two specimens, the holotype caudal parietal bar and a referred incomplete skull, have been assigned to  Rubeosaurus .    Methodology/Principal Findings  A revised interpretation of the parietal processes of USNM 14765, the partial skeleton of a subadult centrosaurine formerly referred to  Brachyceratops , indicates that it shares a P5 spike with the holotype of  Rubeosaurus ovatus  and should therefore be referred to that taxon.  Brachyceratops  is considered a  nomen dubium .    Conclusions/Significance  USNM 14765 provides additional anatomical information for  Rubeosaurus ovatus . These new data are incorporated into a recent phylogenetic analysis of centrosaurine relationships;  Rubeosaurus  appears as the sister taxon of a clade composed of  Einiosaurus ,  Achelousaurus , and  Pachyrhinosaurus .

A Subadult Specimen of Rubeosaurus ovatus (Dinosauria: Ceratopsidae), with Observations on Other Ceratopsids from the Two Medicine Formation