Three new species of Ischnoptera Burmeister, 1838 from Mato Grosso State, Brazil are described (I. miuda, I. irregulata, I. pantaneira). Illustrations of male and female genitalia are presented. Ischnoptera cristata nom. nov. for I. similis Rocha e Silva, 1984, not I. similis R. S.-Albuquerque & Lopes, 1977.
Blattaria; Ischnoptera; new species; Neotropical; Taxonomy