Eight genera and 13 species of the tribe Acanthocerini are recorded in Argentina, i.e., Athaumastus haematicus (St?l), Athaumastus macer Brailovsky, Athaumastus subcarinatus (St?l), Athaumastus subterlineatus Bergroth, Beutelspacoris sanchezi Brailovsky, Beutelspacoris dilatata Casini, Camptischium clavipes (Fabricius), Crinocerus sanctus (Fabricius), Dersagrena flaviventris (Berg), Dersagrena lacerdae (Signoret), Dersagrena subfoveolata (Berg), Thlastocoris hernandezi Brailovsky and Zoreva dentipes Fabricius. Redescriptions are given for Athaumastus haematicus, Athaumastus subcarinatus and Dersagrena flaviventris with photographs of male and female genitalia of Dersagrena subfoveolata. Zoreva recorded from Argentina the first time. New locality records are given for Buenos Aires, Chaco, Formosa, Misiones, and Tucumán.
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