Pepsis sumptuosa Smith, 1855:197, ♀. Holotype ♀, Columbia (leg. W. W. Saunders, Esq.), Lectotype ♀, examined (Hope Entomological Collections, University Museum, Oxford, England), designated by Vardy, 2002Vardy, C.R. 2002. The New World tarantula-hawk wasp genus Pepsis Fabricius (Hymenoptera: Pompilidae). Part 2. The P. grossa- to P. deaurata-groups. Zool. Verh. 337:1-134.. - Smith, 1855Smith, F. 1855. Catalogue of Hymenopterous Insects in the collection of the British Museum. Part III, Mutillidae and Pompilidae. :203 pp, 5 pl. (distribution); Lucas, 1895Lucas, R. 1895. Die Pompiliden-Gattung Pepsis. Berliner Entomologische Zeitschrift 39 (4):449-840. (distribution); Fox, 1897Fox, W.J. 1897. Contributions to a knowledge of the Hymenoptera of Brazil, No. 2. - Pompilidae. Proceedings of the Academy of Natural Sciences of Philadelphia 49:229-283. (distribution), 281 (listed); Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749. (distribution), 263 (listed); Lucas, 1919Lucas, R. 1919. Pompiliden-Studien. I. Arch. Naturgesch., A. 83 (5):1-180+3 pls. (distribution); Banks, 1946Banks, N. 1946. Studies of South American Psammocharidae. Part 1. Bulletin of the Museum of Comparative Zoology at Harvard College 96:311-525. (distribution), 317 (key female), 318 (key male), 323 (description male, listed), 403 (key male); Hurd, 1952Hurd, P.D. Jr. 1952. Revision of the Nearctic species of the pompilid genus Pepsis (Hymenoptera, Pompilidae). The American Museum of Natural History, Bulletin 98 (article 4):261-334. (distribution); Haupt, 1952Haupt, H. 1952. Alte und neue Pepsis-Arten (Hymenoptera-Sphecoidea) Pompilidae, olim Psammocharidae auct. Nova Acta Leopoldina 15 (109):311-414.:402 ( listed as synonym of Pepsis speciosissima Lucas, 1919); Vardy, 2002Vardy, C.R. 2002. The New World tarantula-hawk wasp genus Pepsis Fabricius (Hymenoptera: Pompilidae). Part 2. The P. grossa- to P. deaurata-groups. Zool. Verh. 337:1-134. (distribution), 116 (listed), 117 (description female, description male), 118 (distribution), 28 (key male), 30 (key female), 35 (key male), 55 (key female); Fernández et al., 2017Fernández, F., V. Castro, J. Rodríguez, C. Waichert & J.P. Pitts 2017. Avispas cazadoras de arañas de Colombia (Hymenoptera: Pompilidae). Proceditor Ltda., Bogotá, D. C., Colombia. (distribution); Kurczewski et al., 2020Kurczewski, F.E., R.C. West, C. Waichert, K.C. Kissane, D. Ubick & J.P. Pitts 2020. New and unusual host records for North American and South American spider wasps (Hymenoptera: Pompilidae). Zootaxa 4891 (1):1-112. (distribution), 15 (prey); Fernández et al., 2022Fernández, F., J. Rodriguez, C. Waichert, B. Decker & J. Pitts 2022. Twenty two years later: An updated checklist of Neotropical spider wasps (Hymenoptera: Pompilidae). Zootaxa 5116 (4):451-503. (distribution).
Pepsis colossica Stål, 1857:64, Lectotype ♀, examined (Naturhistoriska Riksmuseet, Stockholm), designated by Vardy, 2002Vardy, C.R. 2002. The New World tarantula-hawk wasp genus Pepsis Fabricius (Hymenoptera: Pompilidae). Part 2. The P. grossa- to P. deaurata-groups. Zool. Verh. 337:1-134.:116. Synonymized with Pepsis sumptuosa Smith, 1855 by Vardy, 2002Vardy, C.R. 2002. The New World tarantula-hawk wasp genus Pepsis Fabricius (Hymenoptera: Pompilidae). Part 2. The P. grossa- to P. deaurata-groups. Zool. Verh. 337:1-134.:116. - Lucas, 1895Lucas, R. 1895. Die Pompiliden-Gattung Pepsis. Berliner Entomologische Zeitschrift 39 (4):449-840. (distribution); Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749. (distribution), 250 (listed); Hurd, 1952Hurd, P.D. Jr. 1952. Revision of the Nearctic species of the pompilid genus Pepsis (Hymenoptera, Pompilidae). The American Museum of Natural History, Bulletin 98 (article 4):261-334. (distribution); Haupt, 1952Haupt, H. 1952. Alte und neue Pepsis-Arten (Hymenoptera-Sphecoidea) Pompilidae, olim Psammocharidae auct. Nova Acta Leopoldina 15 (109):311-414.:402 ( listed as synonym of Pepsis speciosissima Lucas, 1919).
Brethesia apollinarii Brèthes, 1926:9, Lectotype ♂, examined (Museo Argentino de Ciencias Naturales, Buenos Aires), designated by Vardy, 2002Vardy, C.R. 2002. The New World tarantula-hawk wasp genus Pepsis Fabricius (Hymenoptera: Pompilidae). Part 2. The P. grossa- to P. deaurata-groups. Zool. Verh. 337:1-134.:116. Synonymized with Pepsis sumptuosa Smith, 1855 by Vardy, 2002Vardy, C.R. 2002. The New World tarantula-hawk wasp genus Pepsis Fabricius (Hymenoptera: Pompilidae). Part 2. The P. grossa- to P. deaurata-groups. Zool. Verh. 337:1-134.:116.