Neivamyrmex nigrescens

Distribution
This taxon was described from the United States.

Nomenclature

 *  nigrescens. Labidus nigrescens Cresson, 1872: 194 (m.) U.S.A. Wheeler, W.M. 1900a: 563 (q.); Smith, M.R. 1942c: 551 (w.); Wheeler, G.C. & Wheeler, J. 1984: 273 (l.). Combination in Eciton: Dalla Torre, 1893: 5; in E. (Labidus): Emery, 1895c: 261; in E. (Acamatus): Emery, 1900a: 187; in E. (Neivamyrmex): Smith, M.R. 1942c: 550; Gregg, 1963: 286; in Neivamyrmex: Borgmeier, 1955: 494; Watkins, 1972: 349. Senior synonym of schmitti: Smith, M.R. 1938b: 160; Borgmeier, 1955: 494. See also: Watkins, 1972: 358; Smith, D.R. 1979: 1331; Petralia & Vinson, 1980: 378; Ward, 1999a: 84; Snelling, G.C. & Snelling, R.R., 2007: 484.
 * schmitti. Eciton (Acamatus) schmitti Emery, 1894c: 183 (diagnosis in key) (w.) U.S.A. Emery, 1895c: 258 (w.); Wheeler, W.M. & Long, 1901: 161 (m.); Wheeler, G.C. 1943: 331 (l.). Junior synonym of nigrescens: Smith, M.R. 1938b: 160; Borgmeier, 1955: 494.