Abstract
Three new species of Sosippinae from Argentina are described; one new species of Hippasella Mello-Leitao, 1944, H. alhue sp. nov., from temperate Andean forests in the Argentinean provinces of Neuquen and Rio Negro and two new species of Aglaoctenus Tullgren, 1905, A. yacytata sp. nov., from the rainforests in Misiones province, and A. puyen sp. nov., from temperate Andean forests in Rio Negro province. Aglaoctenus oblongus (C. L. Koch, 1847) is recorded for first time in Entre Rios province and new records for Buenos Aires province (Argentina) and Montevideo (Uruguay) are provided. The distribution of A. lagotis (Holmberg, 1876) is updated with first time records for the Argentinean provinces of Jujuy, Salta, Chaco, Formosa, La Rioja, Tucuman, Santiago del Estero, San Luis and Entre Rios, new localities in the provinces of Misiones, Corrientes, Santa Fe and Cordoba.