A new Neotropical species of Pirhosigma Giordani Soika, 1978 is described, Pirhosigma transfluvium Ferreira & Oliveira. The male of Pirhosigma limpidum Giordani Soika, 1978 is reported for the first time. An illustrated identification key is presented for all currently recognized species of Pirhosigma.
Males of Minixi brethesi (Bertoni, 1927) and Minixi tricoloratum (Zavattari, 1911) are described for the first time. The synonymy of Alphamenes insignis loquax Giordani Soika, 1978 under Alphamenes richardsi Giordani Soika, 1978 is proposed. A new way to separate females of Alphamenes usitatus (Fox) from similar species is presented. An updated identification key is presented for the described species of Alphamenes Van der Vecht, 1977.
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