Ten species of Coniopterygidae are listed, nine of which are new. All belong to species groups known from South America. The female genitalia of eight Coniopteryx spp. are drawn, the species are not named. A key to all known spp. of the subgenus Scotoconioteryx Mein. is presented. New spp. are Neoconis brasiliensis n.sp., N. tubifera n.sp., Coniopteryx (Scotoconiopteryx) amazonica n.sp., C. (S.) ariasi n.sp., C. (S.) indivisa n.sp., C. (S.) pennyi n.sp., C. (S.) torquata n.sp., Semidalis amazonensis n.sp., S. manausensis n.sp.