Mutilla propinqua Cresson, 1865:433, ♂. Holotype ♂, Colorado Territory, 1864 (leg. Mr. James Ridings). - Cresson, 1872Cresson, E.T. 1872. Hymenoptera Texana. Transactions of the American Entomological Society 4:153-292. (distribution); Blake, 1879Blake, C.A. 1879. Catalogue of the Mutillidae of North America, with descriptions of new species. Transactions of the American Entomological Society 7:243-254. (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); Fox, 1899Fox, W.J. 1899. The North American Mutillidae. Transactions of the American Entomological Society 25:219-300. (distribution); Melander, 1903Melander, A.L. 1903. Notes on North American Mutillidae, with descriptions of new species. Transactions of the American Entomological Society 29 (4):291-330. (distribution). - As Ephuta propinqua: - Cockerell, 1898Cockerell, T.D.A. 1898. Contributions to the entomology of New Mexico. Proc. Davenport Acad. nat. Sci. 7:139-148. (distribution). - As Pseudomethoca propinqua: - Mickel, 1925Mickel, C.E. 1925. A revision of the mutillid wasps of the genera Myrmilloides and Pseudomethoca occuring in America North of Mexico. Proceedings of the United States National Museum 64 (15):1-52. (distribution); Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209. (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). - As Sphaerophthalma propinqua: - Blake, 1886Blake, C. 1886. Monograph of the Mutillidae of North America. Transactions of the American Entomological Society 13:179-286. (distribution).
Mutilla montivaga Cresson, 1865:436, ♀. 10 ♀♀, Colorado Territory, 1864 (leg. Mr. James Ridings). - Blake, 1879Blake, C.A. 1879. Catalogue of the Mutillidae of North America, with descriptions of new species. Transactions of the American Entomological Society 7:243-254. (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); Fox, 1899Fox, W.J. 1899. The North American Mutillidae. Transactions of the American Entomological Society 25:219-300. (distribution); Melander, 1903Melander, A.L. 1903. Notes on North American Mutillidae, with descriptions of new species. Transactions of the American Entomological Society 29 (4):291-330. (distribution); Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209.:1303 ( listed as synonym of Pseudomethoca propinqua (Cresson, 1865)); 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.:112 ( listed as synonym of Pseudomethoca propinqua (Cresson, 1865)). - As Pseudomethoca montivaga: - Bradley, 1916Bradley, J.C. 1916. Contributions toward a monograph of the Mutillidae and their allies of America north of Mexico. III. The Mutillidae of the Eastern United States. Transactions of the American Entomological Society 42 (3):309-336. (distribution). - As Sphaerophthalma montivaga: - Blake, 1886Blake, C. 1886. Monograph of the Mutillidae of North America. Transactions of the American Entomological Society 13:179-286. (distribution).
Pseudomethoca sacatona Caldwell, 1939:94 - Krombein et al., 1979Krombein, K.V., P.D. Hurd, D.R. Smith & B.D. Burks 1979. Catalog of Hymenoptera in America North of Mexico. Volume 2. Apocrita (Aculeata). Smithsonian Institution Press, Washington D.C. 1199-2209.:1303 ( listed as synonym of Pseudomethoca propinqua (Cresson, 1865)); 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.:112 ( listed as synonym of Pseudomethoca propinqua (Cresson, 1865)).