• Wilson, 1955a: 174 (w.)
• Combination in Lasius (Formicina): Wheeler, 1916o: 172.
• Combination in Lasius (Chthonolasius): Emery, 1925d: 235; Wilson, 1955a: 173.
• Subspecies of Lasius umbratus: Wheeler, 1916o: 172; Wheeler, 1917a: 528; Wheeler, 1917h: 167; Emery, 1925d: 235; Cole, 1936a: 37; Smith, 1951c: 852.
• Status as species: Creighton, 1950a: 425; Wilson, 1955a: 173 (redescription); Smith, 1958c: 150; Yensen et al., 1977: 184; Wheeler & Wheeler, 1978b: 393; Smith, 1979: 1440; Allred, 1982: 483; Wheeler & Wheeler, 1986g: 67; Bolton, 1995b: 226; Ward, 2005: 64.
• Senior synonym of Lasius pilosus: Wilson, 1955a: 173; Smith, 1958c: 150; Smith, 1979: 1440; Bolton, 1995b: 226.

Junior synonyms

• Lasius pilosus Smith, 1934

Obsolete combinations

• Lasius umbratus vestitus

Citations

• Allred, D. M. 1982. Ants of Utah. Great Basin Naturalist 42:415-511.
• Bolton, B. 1995b. A new general catalogue of the ants of the world. Cambridge, Mass.: Harvard University Press, 504 pp.
• Cole, A. C., Jr. 1936a. An annotated list of the ants of Idaho (Hymenoptera: Formicidae). Canadian Entomologist 68:34-39. PDF
• Creighton, W. S. 1950a. The ants of North America. Bulletin of the Museum of Comparative Zoology 104:1-585. PDF
• Emery, C. 1925d. Hymenoptera. Fam. Formicidae. Subfam. Formicinae. Genera Insectorum 183:1-302. PDF
• Smith, D. R. 1979. Superfamily Formicoidea. Pp. 1323-1467 in: Krombein, K. V.; Hurd, P. D.; Smith, D. R.; Burks, B. D. (eds.) 1979. Catalog of Hymenoptera in America north of Mexico. Volume 2. Apocrita (Aculeata). Washington, D.C.: Smithsonian Institution Press, pp. i-xvi, 1199-2209.
• Smith, M. R. 1951c. Family Formicidae. Pp. 778-875 in: Muesebeck, C. F. W.; Krombein, K. V.; Townes, H. K. (eds.) 1951. Hymenoptera of America north of Mexico. Synoptic catalogue. United States Department of Agriculture. Agriculture Monograph 2:1-1420. PDF
• Smith, M. R. 1958c. Family Formicidae. Pp. 108-162 in: Krombein, K. V. (ed.) 1958. Hymenoptera of America north of Mexico. Synoptic catalogue. First supplement. United States Department of Agriculture. Agriculture Monograph 2(suppl. 1):1-305. PDF
• Ward, P. S. 2005. A synoptic review of the ants of California (Hymenoptera: Formicidae). Zootaxa 936:1-68. PDF
• Wheeler, G. C.; Wheeler, J. 1978b. Mountain ants of Nevada. Great Basin Naturalist 38:379-396. PDF
• Wheeler, G. C.; Wheeler, J. 1986g. The ants of Nevada. Los Angeles: Natural History Museum of Los Angeles County, vii + 138 pp. PDF
• Wheeler, W. M. 1910h. The North American forms of Lasius umbratus Nylander. Psyche (Cambridge) 17:235-243. PDF
• Wheeler, W. M. 1916o. Questions of nomenclature connected with the ant genus Lasius and its subgenera. Psyche (Cambridge) 23:168-173. PDF
• Wheeler, W. M. 1917a. The mountain ants of western North America. Proceedings of the American Academy of Arts and Sciences 52:457-569. PDF
• Wheeler, W. M. 1917h. The temporary social parasitism of Lasius subumbratus Viereck. Psyche (Cambridge) 24:167-176. PDF
• Wilson, E. O. 1955a. A monographic revision of the ant genus Lasius. Bulletin of the Museum of Comparative Zoology 113:1-201. PDF
• Yensen, N. P.; Clark, W. H.; Francoeur, A. 1977. A checklist of Idaho ants (Hymenoptera: Formicidae). Pan-Pacific Entomologist 53:181-187. PDF