REVISION OF THE NEW-WORLD SPECIES OF OMMATIUS WIEDEMANN (DIPTERA, ASILIDAE) - THE NEOTROPICAL COSTATUS SPECIES GROUP

Fourteen species of New World Ommatius Wiedemann are assigned to the costatus species group. Characters diagnostic of the group and of each species are described and illustrated, and keys Lo the species are presented. The new species O. achaetus, O. complanatus, O. dentatus, O. didymus, O. humatus, O. incurvatus, O. spinosus, and O. uncatus are described. O. amula Curran and O. costatus Rondani are redescribed. Data are added to existing descriptions of O. alexanderi, O. orenoquensis, O. oreophilus, and O. piliferous. Lectotypes are designated for O. costatus [=O. barbiellinii Curran, NEW SYNONYMY] and O. orenoquensis Bigot [=O. infractus Scarbrough, NEW SYNONYMY]. O. spatulatus, a similar species, is compared with the costatus group.