The genus Synergus Hartig (Hymenoptera: Cynipidae: Synergini) in the New World: a complete taxonomic revision with a key to species Author Lobato-Vila, Irene Author Pujade-Villar, Juli 0000-0001-7798-2717 jpujade@ub.edu text Zootaxa 2021 2021-01-12 4906 1 1 121 journal article 8839 10.11646/zootaxa.4906.1.1 308129a3-a99f-4012-bb41-d3220692c398 1175-5326 4434000 09383AAD-8E30-4E50-A533-C6DA4D00E33C Synergus lignicola ( Osten-Sacken, 1862 ) Cynips ( Synerges ?) lignicola Osten-Sacken, 1862 . Proc. Entomol. Soc. Phil. 1 (8): 252. Type material: MCZ. Synerges (!) rhoditiformis Walsh, 1864 . Proc. Entomol. Soc. Phil. 2: 499. Type material: MCZ. Synonymized by Osten-Sacken (1865: 374) . Synergus lignicola : Osten-Sacken (1865) . Proc. Entomol. Soc. Phil. 4 (3): 374. Andricus davisi Beutenmüller, 1907 . Bull. Am. Mus . Nat. Hist. 23: 463. Type material: USNM ( lectotype ), paralectotypes in USNM, UB, CAS and MCZ. Synonymized by Lobato-Vila et al . (2019: 220). Synergus davisi : Weld (1922) . Proc. U. S. Nat. Mus. 61 (18): 21. Diagnosis . See Lobato-Vila et al . (2019: 222) and the diagnosis of S. atra and S. dimorphus (this work). Distribution . USA : Indiana , Michigan , Missouri , New Jersey , New York , Washington D.C. , and Virginia ( Beutenmüller 1907 ; Burks 1979 ); and Mexico : Hidalgo (Lobato-Vila et al . 2018). Biology . Reared from tuberous twig galls of Callirhytis cornigera ( Osten-Sacken, 1865 ) on Q. palustris , and from tuberous twig galls of Callirhytis quercuspunctata (Basset, 1863) on Q. velutina ( Osten-Sacken 1865 ; Burks 1979 ); from galls of Callirhytis quercusgemmaria ( Ashmead, 1885 ) on Q. ilicifolia ( Beutenmüller 1907 ; Burks 1979 ); and from asexual tuberous twig galls of Andricus quercuslaurinus Melika & Pujade-Villar, 2009 on Q . affinis (Lobato-Vila et al. 2018) . Weld (1951) also mentions Q. incana and other red oaks. Remarks . The type material of Synergus lignicola was examined and the species was treated and illustrated by Lobato-Vila et al . (2019: 220). Previously, the type material of its synonym, S. davisi , was examined and redescribed by Lobato-Vila et al . (2018: 594).