Struthiomimus gen. nov.

Generic characters of Struthiomimus . Stage of evolution of the Ornithomimidae, corresponding with the Judith River or Belly River formation, Monoclonius-Ceratops zone. Skull relatively small, edentulous; manus isotridactyl, with elongate and slightly recurved terminal phalanges, metacarpals I—II incipiently coalescent; pollex phalanges separate, divergent; pes anisotetradactyl, Mts. II, III, IV incipiently coalescent, Mts. V present, reduced; Digit III relatively elongated.

The generic characters are based upon the complete skeleton of Struthiomimus altus, Amer. Mus. 5339 .