1987 P. 8 Hacienda Zapotitan, Dept., La Libertad, Salvador at the Rio Sucio. The first bunch I saw were clinging to the under side of a large dead tree trunk that leaned out over the river. There were approximately fifteen. Their method of position of resting was like that of Peocopteryx. When I threw a stone into the water and frightened them from their shaded resting place their swallow like flight could not have been mistaken for that of any other bat. A hundred yards farther down stream I saw a colony of perhaps thirty five flutter about under a flow bridge when a carreta crossed.