Arachnophroctonus ferrugineus annexus Banks, 1944:168, Holotype, Fedor, Lee Co., June 15 (M.C.Z., No. 25731, leg. Birkmann); Evans, 1950Evans, H.E. 1950. A taxonomic study of the Nearctic spider wasps belonging to the tribe Pompilini (Hymenoptera: Pompilidae). Part 1. Transactions of the American Entomological Society 75:133-270.:262, Type ♀ (M.C.Z., no. 25,731). Synonymized with Tachypompilus ferrugineus burrus (Cresson, 1869) by Evans, 1950Evans, H.E. 1950. A taxonomic study of the Nearctic spider wasps belonging to the tribe Pompilini (Hymenoptera: Pompilidae). Part 1. Transactions of the American Entomological Society 75:133-270.:262. - Junco y Reyes, 1959Junco y Reyes, J.J. 1959. Himenópteros de Espana. Fam. Pompilidae (=Psammocharidae) Gen. Anopilus Duf. EOS Revista Española de Entomologia 35:41-95.:50 ( listed as synonym of Tachypompilus ferrugineus burrus (Cresson, 1869)). - As Tachypompilus ferrugineus anexxus: - Vanoye-Eligio et al., 2021Vanoye-Eligio, M., M. del C. Gómez-Camal, B. del R. Martín-Canché, M. Rosas-Mejía, J.V. HortaVega & V. Vanoye-Eligio 2021. Current knowledge of the family Pompilidae (Hymenoptera: Vespoidea) in Mexico: diversity and geographical distribution. Zootaxa 5071 (4):505-536. (distribution). - As Tachypompilus ferrugineus annexus: - 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); Hook et al., 1990Hook, A.W., H.E. Evans & J.E. Gillaspy 1990. Pompilid wasps of Brackridge Field Laboratory and of the Greater Austin Area. Sphecos 20:17-18. (distribution).