Ommatius tractus, n. sp., from Santo Amaro, Brazil, is described, illustrated, and diagnosed. A modified key is presented to aid in its identification. Ommatius spatulatus Curran is placed in the species group and is reported from Argentina for the first time. Ommatius riali Vieira, Castro & Bravo is established as a New Synonym of O. spatulatus Curran. A check list of the costatus species group is also included.
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Vol. 133 • No. 3