Pseudomethoca willei Mickel, 1928 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.:302, Holotype ♀ (UMSP). - 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); Lo Cascio, 2015Lo Cascio, P. 2015. Worldwide checklist of the island mutillid wasps (Hymenoptera Mutillidae). biodiversity Journal 6 (2):529-592. (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).
Pseudomethoca transversa Brothers, 1982:209, ♀. Holotype ♀, Barro Colorado Id., / Panama C. Z., 24-II-1955 (Snow Entomological Museum, University of Kansas, Lawrence, leg. Carl Rettenmeyer); 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.:302, Holotype ♀ (Snow Entomological Museum, University of Kansas). Synonymized with Pseudomethoca willei Mickel, 1928 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.:302. - Brothers, 1982Brothers, D.J. 1982. Two new species of Mutillidae associated with Halictus hesperus (Halictidae) in Panama (Hymenoptera). Sociobiology 7 (2):205-212. (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.:114 ( listed as synonym of Pseudomethoca willei Mickel, 1928).