Crabro verticalis Smith, 1873:104 - Dalla Torre, 1897Dalla Torre, C.G. 1897. Catalogus hymenopterorum hucusque descriptorum systematicus et synonymicus. Volumen VIII: Fossores (Sphegidae). Breitkopf & Härtel, Leipzig. 1-749. (distribution). - As Quexua verticalis: - Leclercq, 2002Leclercq, J. 2002. Hyménoptères Crabonides Crabonines de l`Amérique latine du genre Quexua Pate, 1942. Notes fauniques de Gembloux 46:3-12. (distribution); Amarante, 2002Amarante, S.T.P. 2002. A synonymic catalog of the neotropical Crabronidae and Sphecidae (Hymenoptera: Apoidea). Arquivos de Zoologia (São Paulo) 37:1-139. (distribution); Leclercq, 2005Leclercq, J., 2005. Hyménoptères Crabroniens de l'Amérique latine des genres Pae Pate, 1944, et Quexua Pate, 1942 (Hymenoptera: Crabronidae, Crabronini). Notes fauniques de Gembloux 55:7-10. (distribution); Rasmussen & Asenjo, 2009Rasmussen, C. & A. Asenjo 2009. A checklist to the wasps of Peru (Hymenoptera, Aculeata). ZooKeys 15:1-78. (distribution).
Quexua llameo Pate, 1942:64 - Amarante, 2002Amarante, S.T.P. 2002. A synonymic catalog of the neotropical Crabronidae and Sphecidae (Hymenoptera: Apoidea). Arquivos de Zoologia (São Paulo) 37:1-139.:33 ( listed as synonym of Quexua verticalis (Smith, 1873)).