Tiuamon (Tinamus), a South American genus of birds sometimes called partridges, but really more akin to bustards, and having affinities with the Rhea and Emu. T. major or brasilensis is about 18 inches long.
Tiuamon
Chambers's Encyclopaedia, Volume 10: Swastika to Zyrianovsk and Index, p. 216
Source scan(s): p. 0235