Ornithomimus tenuis, Marsh, 1890

Marsh, O. C., 1890, Description of new dinosaurian reptiles, American Journal of Science 39 (229), pp. 81-87 : 85

Two other species, apparently of the same genus, are represented by various specimens from the same horizon, in Montana.

One of these, which may be called Ornithomimus tenuis ,

was about twice the bulk of the present form. The third metatarsal was much more compressed transversely, both in the shaft and distal end. The bone was also much more slender medially than in the above species. The transverse diameter of this metatarsal at its distal end was 30mm., and the antero-posterior diameter, 35mm.