opaca. Crematogaster opaca Mayr, 1870b: 992 (w.) MEXICO. Combination in C. (Acrocoelia): Emery, 1922e: 141; in C. (Crematogaster): Bolton, 1995b: 166. Subspecies of lineolata: Emery, 1895c: 283; Wheeler, W.M. 1908e: 478; Wheeler, W.M. 1914b: 44; Emery, 1922e: 141. Revived status as species: Wheeler, W.M. 1919g: 111; Wheeler, W.M. 1934f: 139. Current subspecies: nominal plus cedrosensis.