Lasius aphidicola

Distribution based on Regional Taxon Lists
Nearctic Region: Canada, United States. Neotropical Region: Mexico.

Nomenclature

 *  aphidicola. Formica aphidicola Walsh, 1863: 310 (w.q.m.) U.S.A.
 * [Note: type-locality Illinois: Rock I., after Wheeler, W.M. 1910e: 240.]
 * Wheeler, G.C. & Wheeler, J. 1953c: 150 (l.).
 * Combination in Lasius: Mayr, 1886d: 429;
 * combination in Lasius (Chthonolasius): Ruzsky, 1912: 633; Ruzsky, 1914a: 61.
 * As unavailable (infrasubspecific) name: Emery, 1893i: 640; Wheeler, W.M. 1900c: 47; Wheeler, W.M. 1904e: 305; Wheeler, W.M. 1905f: 397; Wheeler, W.M. 1906b: 13; Wheeler, W.M. 1910e: 239; Wheeler, W.M. 1910g: 569; Wheeler, W.M. 1916k: 172; Wheeler, W.M. 1916m: 593; Wheeler, W.M. 1917a: 528; Wheeler, W.M. 1917h: 167; Wheeler, W.M. 1917i: 463; Emery, 1925b: 235; Smith, M.R. 1928c: 277; Dennis, 1938: 296; Wing, 1939: 164; Wesson, L.G. & Wesson, R.G. 1940: 101; Cole, 1942: 375; Smith, M.R. 1951a: 852.
 * Junior synonym of flavus: Mayr, 1886d: 429; Cresson, 1887: 255.
 * Subspecies of umbratus: Emery, in Dalla Torre, 1893: 182; Wheeler, W.M. 1908g: 406; Buren, 1944a: 297; Wheeler, G.C. & Wheeler, E.W. 1944: 257; Creighton, 1950a: 425.
 * Junior synonym of umbratus: Wilson, 1955a: 150; Smith, D.R. 1979: 1439.
 * Senior synonym of epinotalis: Schär et al., 2018: 6.
 * Status as species: Mayr, 1863: 411; Schär et al., 2018: 6.
 * epinotalis. Lasius (Chthonolasius) umbratus subsp. epinotalis Buren, 1944a: 297 (w.) U.S.A.
 * Junior synonym of umbratus: Wilson, 1955a: 152.
 * Junior synonym of aphidicolus: Schär et al., 2018: 6.

Taxonomic Notes
Schär et al. (2018): Lasius aphidicolus (Walsh, 1863) stat. nov. was treated as a junior synonym of ''La. flavus by Mayr (1886), a subspecies of La. umbratus by Wheeler (1908) and most recently as a junior synonym of La. umbratus'' by Wilson (1955). Our results suggest that Lasius aphidicolus (Walsh, 1863) should be treated as a valid species. The junior synonym Lasius umbratus epinotalis Buren, 1944 should be transferred from synonymy with L. umbratus to synonymy with ''La. aphidicolus''.