Euplilis grenadinus Pate, 1947:8, ♂. Holotype ♂, Chantilly Estate, Windward side, Grenada, British West Indies (United States National Museum, leg. H.H. Smith); Leclercq, 2002Leclercq, J. 2002. Hyménoptères Crabonides Craboniens des Amériques du genre Rhopalum Stephens, 1829. Notes fauniques de Gembloux 48:3-115.:62, Holotype ♂ (Washington). - As Euplilis grenadinum: - Alayo, 1968Alayo, P.D. 1968. Estudios sobre los Himenópteros de Cuba. II – Subfamilia Crabroninae (Familia Sphecidae). Poeyana (Serie A) 58:1-28. (distribution). - As Rhopalum grenadinum: - 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, 2002Leclercq, J. 2002. Hyménoptères Crabonides Craboniens des Amériques du genre Rhopalum Stephens, 1829. Notes fauniques de Gembloux 48:3-115. (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); Hook et al., 2014Hook, A.W., J.L. Neff, M.S. Engel & H. Court 2014. The Apoidea (Hymenoptera) Fauna of Little Tobago Island, West Indies. Journal of the Kansas Entomological Society 87 (2):242-244. (distribution).