A sixth species, "Ornithomimus altus", was named in 1902 by Lawrence Lambe, based on specimen CMN 930, hindlimbs found in 1901 in Alberta, but this was in 1916 renamed to a separate genus, "Struthiomimus", by Henry Fairfield Osborn. In 1920 Charles Whitney Gilmore named "Ornithomimus affinis" for "Dryosaurus grandis" Lull 1911, based on indeterminate material. In 1930 Loris Russell renamed "Struthiomimus brevetertius" Parks 1926 and "Struthiomimus samueli" Parks 1928 into "Ornithomimus brevitertius" and "Ornithomimus samueli". The same year Oliver Perry Hay renamed "Aublysodon mirandus" Leidy 1868 into "Ornithomimus mirandus", today seen as a "nomen dubium". In 1933 William Arthur Parks created a "Ornithomimus elegans", today seen as either belonging to "Chirostenotes" or "Elmisaurus". That same year, Gilmore named "Ornithomimus asiaticus" for material found in Inner Mongolia.