Sycorax peruensis sp.n. is the first blood sucking fossil Psychodidae in South America. The new species mainly differs from all recent Neotropical Sycoracinae in its number of antennal segments. It is described from the middle Miocene Western Amazonian amber, which included an intertropical entomofauna previous to the land connection with Central and North America that occurred in the latest MiocenePliocene. Insects from this material are diverse with normal bias for amber inclusions of Diptera and Hymenoptera and small-sized specimens.