Reference

James A. Nicholls, George Melika, John D. Demartini, Graham N. Stone (2018): A new species of Andricus Hartig gallwasps from California (Hymenoptera: Cynipidae: Cynipini) galling Notholithocarpus (Fagaceae) – Integrative Systematics: Stuttgart Contributions to Natural History – 1: 17 - 24.