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Meropachyinae Stål, restricted to the western hemisphere, is a relatively small group of Heteroptera, the subfamily include 3 tribes, the tribe Merocorini is represented by a single genus Merocoris Perty with 2 subgenera and 6 species, Subgenus Merocoris Perty with 3 South American species: M. (M.) bergi Mayr, M. (M.) elevatus (Spinola), and M. (M.) tristis Perty. The purposes of this contribution is to redescribe the species M. (M.) bergi, M. (M.) elevatus and M. (M.) tristis, give a key for the identification of species Merocoris in Argentina and including new contributions of geographical distribution are provided for Argentina (Neotropical region).