Chthonolasius

This genus is not in use as it is currently considered to be a junior synonym of Lasius.

Nomenclature

 * CHTHONOLASIUS [junior synonym of Lasius]
 * Chtonolasius Ruzsky, 1912: 630 [as subgenus of Lasius]. Type-species: Formica umbrata, by subsequent designation of Emery, 1925b: 232.
 * [Chtonolasius also described as new by Ruzsky, 1914a: 59. The claim by some authors (e.g. Emery, 1916a: 11; Donisthorpe, 1941f: 37; Donisthorpe, 1943f: 633) that Ruzsky nominated Lasius flavus as type-species is incorrect. Ruzsky (1912: 630) included those species "with the appearance of the yellow Lasius (Las. flavus D.G.) and its closely related species, and races (Las. carniolicus, Las. umbratus, Las. myops, Las. mixtus)". This is not a direct nomination of a type-species, nor is De Geer (D.G.) the author of flavus: Bolton, 1995b: 24.]
 * Chthonolasius justified emendation of spelling: Wheeler, W.M. 1916k: 170.
 * Chthonolasius junior synonym of Formicina: Wheeler, W.M. 1916k: 172; Emery, 1916a: 11.
 * Chthonolasius subgenus of Acanthomyops: Donisthorpe, 1927b: 254.
 * Chthonolasius subgenus of Lasius: Wheeler, W.M. 1922a: 698; Emery, 1925b: 231; Wilson, 1955a: 13.
 * Chthonolasius subgenus of Lasius: Boudinot et al., 2022: 135.