Arrenurus corniger Koenike, 1894

Material examined— Argentina. Entre Ríos Province: 3/6/0, ditch at Brazo Largo, N of Zarate, 33°54’37,21” S, 58°51’9,24” W, 6-xi-1999.

Distribution — Known from Brazil (Koenike 1894, Viets 1936, 1954a, Lundblad 1944) and Argentina (Rosso de Ferradas 1981b). Marshall (1903) reported this species from North America, but these specimens do not belong A to. corniger as the dagger-like petiole is lacking, the hump of the cauda is more pointed and the posterior end of cauda has a different shape.