U.M. Dzialosz 1978 Basileuterus culicivorus El Guiol, 230 m., 19.5 km. NNE Encarnacion by road Dpto. Itapua, Paraguay. 24 September, call, but one of the birds was also giving a high, tinkling call. I recorded a series of these calls. Both birds, were giving these calls calling when I approached, and called from a few feet above me when I recorded them. They were moving around quite nervously, and became more frantic when I played back a few calls.