Abstract
From the Amazon Basin 3 spp of Neoconis End., 4 spp of Semidalis and 15 spp of Coniopteryx are reported. The biogeography of the Coniopterygidae of South America is discussed. New species are: Semidalis normani sp. n., S. rondoniensis sp. n., Coniopteryx (Scotoconiopteryx) bicornis sp. n., C. (S.) canopia sp. n., C. (S.) cucuminicola sp. n., C. (S.) quadricornis sp. n., C. (S.) rondoniensis sp. n., C. (S.) silvicola sp. n. and Coniopteryx (Coniopteryx) jorgei sp. n.