Formica obscuriventris

This species nests under logs or stones, usually partially covered with thatch.

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

Biology
Syrphidae in the genus Microdon are predators on ant brood within the nest.

Nomenclature

 *  obscuriventris. Formica truncicola var. obscuriventris Mayr, 1870b: 951 (w.) U.S.A. Wheeler, W.M. 1913f: 446 (q.m.). Subspecies of rufa: Mayr, 1886d: 426; Emery, 1893i: 649; Wheeler, W.M. 1908g: 408; Creighton, 1940a: 1; of truncicola: Wheeler, W.M. 1913c: 116; Wheeler, W.M. 1913f: 445; Wheeler, W.M. 1917i: 464. Raised to species: Creighton, 1950a: 493. Senior synonym of dryas: Wheeler, W.M. 1913f: 446; of gymnomma: Creighton, 1950a: 493. Current subspecies: nominal plus clivia.
 * dryas. Formica dryas Wheeler, W.M. 1905c: 268 (w.q.) U.S.A. Junior synonym of obscuriventris: Wheeler, W.M. 1913f: 446.
 * gymnomma. Formica dryas var. gymnomma Wheeler, W.M. 1905c: 269 (w.) U.S.A. Subspecies of rufa: Creighton, 1940a: 3. Junior synonym of obscuriventris: Creighton, 1950a: 493.