Four new species of Ischnodemus (Hemiptera, Heteroptera, Blissidae) and additional records from Argentina.

Four new species of the genus Ischnodemus Fieber, 1837 (Hemiptera, Heteroptera, Blissidae) are described from Argentina: I. nigromaculatoides sp. nov., I. formosus sp. nov., I. infernalis sp. nov. and I. correntinus sp. nov. The known distribution is extended for three previously recorded species