Agenia euphorbiae Viereck, 1902:734, ♂. Holotype ♂, San Pedro, Cal., July 27, 1901 (Coll. Acad. Nat. Sci. Philadelphia, leg. Prof. Cockerell). - As Ageniella euphorbiae: - Banks, 1919Banks, N. 1919. The Psammocharidae of western North America. Bull. Mus. Comp. Zool. 63:229-248. (distribution), 242 (key male), 243 (listed); Krombein, 1958Krombein, K.V. 1958. Family Pompilidae. In: Krombein, K.V. (Ed.). Hymenoptera of America North of Mexico - Synoptic Catalog. Washington: U.S. Department of Agriculture. Agriculture Monograph No. 2. First Supplement, 305 pp. 170-186.:175 (listed); Kurczewski & Kurczewski, 1968Kurczewski, F.E. & E.J. Kurczewski 1968. Host records for some North American Pompilidae (Hymenoptera) with a discussion of factors in prey selection. Journal of the Kansas Entomological Society 41 (1):1-33. (distribution), 7 (hosts); 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); Kurczewski, 1987Kurczewski, F.E. 1987. Nest and Prey of Ageniella (Leucophrus) fulgifrons (Hymenoptera: Pompilidae). The Great Lakes Entomologist 20 (2):75-80.:79 (prey); Evans, 1997Evans, H.E. 1997. Spider wasps of Colorado (Hymenoptera, Pompilidae): An annotated checklist. The Great Basin Naturalist 57 (3):189-197. (distribution); Horta Vega et al., 2009Horta Vega, J.V., M.E.García Gutiérrez, M.I. Benavides Martínez & A. Correa Sandoval 2009. Pompilidae (Hymenoptera) de algunos municipios del centro y sur de Tamaulipas, México. Acta Zool. Mex. (n.s.) 25 (1):71-82. (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), 40 (prey); 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 Ageniella petiolata euphorbia:
Ageniella subaequalis Banks, 1919:243, ♂.B. Col.: Revelstoke, Selkirk Mts., 1 July (leg. Bradley); Type (Cornell Univ. Coll). - Banks, 1919Banks, N. 1919. The Psammocharidae of western North America. Bull. Mus. Comp. Zool. 63:229-248.:242 (key male); 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.:1541 ( listed as synonym of Ageniella euphorbiae (Viereck, 1902)).