Remarks: Probably somewhere in the Tocantins-Araguaia system. Collected after
the conclusion of the Thayer Expedition, at Agassiz's specific request, for
comparison with lower Rio Tocantins specimens (James, 1952:158,172). Isbrcker
(1973:174) suggests this locality is "Rio Araguaia drainage, upper course of
Rio Vermelho at Gois (1557'S 5007'W)", based on the map in Eigenmann
& Eigenmann (1890: back page), but this has not been positively confirmed.