Natterer collected this species at the Curicuriari River in northwestern Brazil. in A New Species of the Rodent Genus Oecomys (Cricetidae: Sigmodontinae: Oryzomyini) from Eastern Bolivia, with Emended Definitions of O. concolor (Wagner) and O. mamorae (Thomas)

Natterer collected this species at the Curicuriari River in northwestern Brazil. H. concolorH. AnguyaBody4 " 10 "|5 " 8 "Tail4 9|5 6Ear0 6 2/2 [sic]|0 8Hindfoot1 0|1 3 Natterer collected this species at the Curicuriari River in northwestern Brazil.