Crossocerus callani Pate, 1941:5, ♀. Holotype ♀, Brasso, Trinidad, British West Indies, February 23, 1940 (Academy of Natural Sciences of Philadelphia, Type no. 10579, leg. Edward McC. Callan). - Callan, 1991Callan, E.Mc C. 1991. Sphecidae of Trinidad. III. Crabroninae, Nyssoninae and Philanthinae. Sphecos 21:8-12. (distribution); Leclercq, 2000Leclercq, J. 2000. Hyménopteres Sphécides Crabroniens des Amériques du genre Crossocerus Lepeletier & Brullé, 1835. Notes fauniques de Gembloux 40:3-75. (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); Starr & Hook, 2003Starr, C.K. & Hook, A.W. 2003. The aculeate Hymenoptera of Trinidad, West Indies. Occasional Papers o the Department of Life Sciences, University of the West Indies 12:1-31. (distribution); Amarante, 2005Amarante, S.T.P. 2005. Addendum and corrections to a synonymic catalog of Neotropical Crabronidae and Sphecidae. Papéis Avulsos de Zoologia 45 (1):1-18. (distribution); Rasmussen & Asenjo, 2009Rasmussen, C. & A. Asenjo 2009. A checklist to the wasps of Peru (Hymenoptera, Aculeata). ZooKeys 15:1-78. (distribution).
Crossocerus potosus Leclercq, 1968:95, Leclercq, 2000Leclercq, J. 2000. Hyménopteres Sphécides Crabroniens des Amériques du genre Crossocerus Lepeletier & Brullé, 1835. Notes fauniques de Gembloux 40:3-75.:35, Holotype ♀ (Wien). Synonymized with Crossocerus callani Pate, 1941 by Leclercq, 2000Leclercq, J. 2000. Hyménopteres Sphécides Crabroniens des Amériques du genre Crossocerus Lepeletier & Brullé, 1835. Notes fauniques de Gembloux 40:3-75.:35. - Amarante, 2005Amarante, S.T.P. 2005. Addendum and corrections to a synonymic catalog of Neotropical Crabronidae and Sphecidae. Papéis Avulsos de Zoologia 45 (1):1-18.:5 ( listed as synonym of Crossocerus callani Pate, 1941).