The Shannoni complex consists of a group of sand fly species included in the subgenus Psathyromyia (Psathyromyia) Barretto, 1962, in which the females have banana-shaped spermathecae and the males have terminalia with digitiform parameres. The species included in the complex present morphological similarity, mainly among the females, and the males contribute most clearly to species differentiation. We describe a new species in the Shannoni complex, Psathyromyia baratai sp. n., on the basis of morphological and morphometric characters, a species which due to its great morphological similarity with Psathyromyia abonnenci, Psathyromyia limai, and Psathyromyia shannoni has been erroneously identified with one or other of them for >60 yr.