﻿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. nigromaculatoidessp. nov., I. formosussp. nov., I. infernalissp. nov. and I. correntinussp. nov. The known distribution is extended for three previously recorded species in the country. The species Ischnodemus brusai Dellapé & Montemayor, 2009 from Peru is transferred to Patritiodemus Slater & Ahmad, 1971. Dorsal habitus photographs and detailed images of the pygophore and right paramere of the new species and a key to the Argentinean species of Ischnodemus are given.