All the members of Eucharitidae are parasitoid of ants. Argentina has 14 genera and 41 species, but little is known about their biology. Herein are provided new data for host associations (host ant and/or host plant) of Galearia latreillei, Kapalaspp., Latina rugosa, Orasema aenea, and Orasemasp. A revision of the most relevant biological aspects of Dicoelothorax platycerus, Latina rugosa, Neolirata alta, N. daguerrei, Lophyrocera variabilis, Orasema argentina, O. salebrosa, O. simplex, O. susanae, O. worcesteri, and O. xanthopusis included. New records of K. sulcifacies, Lo. plagiata, and Ob. semifumipennisin Argentina are presented. Galearia proseniis synonymized with G. latreillei.