Mutilla trifida Gerstäcker, 1874:327, ♂. ♂, Venezuela (Mus. Halens.); ♂, Surinam (Mus. Berol.); Quintero & Cambra, 2001Quintero, A.D. & R.A. Cambra 2001. On the identity of Scaptopoda F. Lynch Arribálzaga, new taxonomic changes and new distribution records for neotropical Mutillidae (Hymenoptera), with notes on their biology. Transactions of the American Entomological Society 127 (3):291-304.:296, Syntype ♂ (Zentralinst. Museum Naturkunde, Humboldt-Universität zu Berlin). - Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749. (distribution). - As Ephuta trifida: - Mickel, 1952Mickel, C.E. 1952. The Mutillidae (Wasps) of British Guiana. Zoologica (New York) 37 (3):105-150. (distribution), 112 (comb. nov.); Quintero & Cambra, 2001Quintero, A.D. & R.A. Cambra 2001. On the identity of Scaptopoda F. Lynch Arribálzaga, new taxonomic changes and new distribution records for neotropical Mutillidae (Hymenoptera), with notes on their biology. Transactions of the American Entomological Society 127 (3):291-304. (distribution); Rasmussen & Asenjo, 2009Rasmussen, C. & A. Asenjo 2009. A checklist to the wasps of Peru (Hymenoptera, Aculeata). ZooKeys 15:1-78. (distribution); Añino et al., 2020Añino, Y.J., R.A. Cambra, D.M. Windsor & K.A. Williams 2020. Seasonal and annual abundance of Ephuta wasp (Hymenoptera: Mutillidae) in Panama. Revista de Biología Tropical (International Journal of Tropical Biology and Conservation) 68 (2):573-579. (distribution); Pagliano et al., 2020Pagliano G., D.J. Brothers, R. Cambra, A.S. Lelej, P. Lo Cascio, M.M. Palmerini, P.L. Scaramozzino, K.A. Williams & M. Romano 2020. Checklist of names in Mutillidae (Hymenoptera), with illustrations of selected species. Bolletino del Museo Regionale di Scienze naturali Torino 36 (1-2):5-425. (distribution).
Mutilla chiriquensis Cameron, 1894:301, ♀. ♀, Panama, Volcan de Chiriqui 2500 to 4000 feet (leg. Champion); Quintero & Cambra, 2001Quintero, A.D. & R.A. Cambra 2001. On the identity of Scaptopoda F. Lynch Arribálzaga, new taxonomic changes and new distribution records for neotropical Mutillidae (Hymenoptera), with notes on their biology. Transactions of the American Entomological Society 127 (3):291-304.:296, Holotype ♀ (BMNH, type 15.1030). Synonymized with Ephuta trifida (Gerstäcker, 1874) by Quintero & Cambra, 2001Quintero, A.D. & R.A. Cambra 2001. On the identity of Scaptopoda F. Lynch Arribálzaga, new taxonomic changes and new distribution records for neotropical Mutillidae (Hymenoptera), with notes on their biology. Transactions of the American Entomological Society 127 (3):291-304.:296. - Cameron, 1888-1900Cameron, P. 1888-1900. Biologia Centrali-Americana - Insecta. Hymenoptera. (Fossores) Vol. II. R. H. Porter and Dulau & Co., London. 413pp, 14 pl.:301 (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); Pagliano et al., 2020Pagliano G., D.J. Brothers, R. Cambra, A.S. Lelej, P. Lo Cascio, M.M. Palmerini, P.L. Scaramozzino, K.A. Williams & M. Romano 2020. Checklist of names in Mutillidae (Hymenoptera), with illustrations of selected species. Bolletino del Museo Regionale di Scienze naturali Torino 36 (1-2):5-425.:216 ( listed as synonym of Ephuta trifida (Gerstäcker, 1874)).
Ephuta viata Casal, 1968:88, Quintero & Cambra, 2001Quintero, A.D. & R.A. Cambra 2001. On the identity of Scaptopoda F. Lynch Arribálzaga, new taxonomic changes and new distribution records for neotropical Mutillidae (Hymenoptera), with notes on their biology. Transactions of the American Entomological Society 127 (3):291-304.:296, Holotype ♂ (AMNH). Synonymized with Ephuta trifida (Gerstäcker, 1874) by Quintero & Cambra, 2001Quintero, A.D. & R.A. Cambra 2001. On the identity of Scaptopoda F. Lynch Arribálzaga, new taxonomic changes and new distribution records for neotropical Mutillidae (Hymenoptera), with notes on their biology. Transactions of the American Entomological Society 127 (3):291-304.:296. - Rasmussen & Asenjo, 2009Rasmussen, C. & A. Asenjo 2009. A checklist to the wasps of Peru (Hymenoptera, Aculeata). ZooKeys 15:1-78. (distribution); Pagliano et al., 2020Pagliano G., D.J. Brothers, R. Cambra, A.S. Lelej, P. Lo Cascio, M.M. Palmerini, P.L. Scaramozzino, K.A. Williams & M. Romano 2020. Checklist of names in Mutillidae (Hymenoptera), with illustrations of selected species. Bolletino del Museo Regionale di Scienze naturali Torino 36 (1-2):5-425.:216 ( listed as synonym of Ephuta trifida (Gerstäcker, 1874)).