Synergus atripennis Ashmead, 1896:189, ♀. 5 ♀♀, Crescent City, Fla., bred June 28, 1883 (leg. H.G. Hubbard); Lobato-Vila & Pujade-Villar, 2021Lobato-Vila, I. & J. Pujade-Villar 2021. The genus Synergus Hartig (Hymenoptera: Cynipidae: Synergini) in the New World: a complete taxonomic revision with a key to species. Zootaxa 4906 (1):1-121.:18, Lectotype ♀ (U.S.N.M., No. 3290). - 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 1. Symphyta and Apocrita (Parasitica). Smithsonian Institution Press, Washington D.C. 1-1198. (distribution); Pénzes et al., 2012Pénzes, Z. C.-T. Tang, P. Bihari, M. Bozsó, S. Schwéger & G. Melika 2012. Oak associated inquilines (Hymenoptera, Cynipidae, Synergini). TISCIA monograph series 11:1-76. (distribution); Nastasi & Deans, 2021Nastasi, L.F. & A.R. Deans 2021. Catalogue of Rose Gall, Herb Gall, and Inquiline Gall Wasps (Hymenoptera: Cynipidae) of the United States, Canada and Mexico. Biodiversity Data Journal 9 (e68558):1-41. (distribution); Lobato-Vila & Pujade-Villar, 2021Lobato-Vila, I. & J. Pujade-Villar 2021. The genus Synergus Hartig (Hymenoptera: Cynipidae: Synergini) in the New World: a complete taxonomic revision with a key to species. Zootaxa 4906 (1):1-121. (distribution).