Pompilus impiger Cresson, 1869:371, ♀. Holotype ♀, Orizaba (Am. Ent. Soc., leg. Prof. F. Sumichrast). - Cameron, 1893Cameron, P. 1893. Biologia Centrali-Americana. Insecta. Hymenoptera. (Fossores) Vol. II. :177-257.:182 (listed); Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749.:229 (listed); Bradley, 1944Bradley, J.C. 1944. The generic position of certain Mexican Pompilidae (Hymenoptera), with description of a new genus. Notulae Naturae, The Academy of Natural Sciences of Philadelphia 145:1-12.:3 (listed). - As Calicurgus impiger: - Bradley, 1944Bradley, J.C. 1944. The generic position of certain Mexican Pompilidae (Hymenoptera), with description of a new genus. Notulae Naturae, The Academy of Natural Sciences of Philadelphia 145:1-12.:3 (comb. nov.); Junco y Reyes, 1951Junco y Reyes, J.J. 1951. Himenópteros de Espana. Fam. Psammocharidae (Olim. Pompilidae). II. Claveliinae, Calicurgini. EOS Revista Española de Entomologia 27 (2):143-233. (distribution). - As Salius impiger: - Cameron, 1888-1900Cameron, P. 1888-1900. Biologia Centrali-Americana - Insecta. Hymenoptera. (Fossores) Vol. II. R. H. Porter and Dulau & Co., London. 413pp, 14 pl.:182 (listed); Cameron, 1893Cameron, P. 1893. Biologia Centrali-Americana. Insecta. Hymenoptera. (Fossores) Vol. II. :177-257. (distribution), 182 (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), 229 (listed); Bradley, 1944Bradley, J.C. 1944. The generic position of certain Mexican Pompilidae (Hymenoptera), with description of a new genus. Notulae Naturae, The Academy of Natural Sciences of Philadelphia 145:1-12.:3 (listed).