Monomorium cyaneum

This species normally nests under stones (or logs), but may have a simple nest in the soil, surrounded by a small mound. Brood was found in nests in June to August, sexuals were in nests in July. A dealate female was collected in August. One colony was collected together with Formica fusca, a second with Acanthomyops coloradensis. (Mackay and Mackay 2002)

Identification
Key to New World Monomorium workers, queens, males

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

Habitat
This species occurs in essentially all habitats from arid zones to grasslands, sagebrush, pinyon-pine and to wet mid altitude ponderosa pine forests, to urban habitats, it is most common in semiarid habitats. (Mackay and Mackay 2002)

Nomenclature

 *  cyaneum. Monomorium minimum subsp. cyaneum Wheeler, W.M. 1914b: 43 (w.q.) MEXICO. DuBois, 1986: 84 (m.). Raised to species: DuBois, 1981: 35. Senior synonym of emersoni: DuBois, 1986: 82.
 * emersoni. Monomorium minimum subsp. emersoni Gregg, 1945b: 66 (w.q.) U.S.A. Junior synonym of minimum: Creighton, 1950a: 219; Smith, D.R. 1979: 1382; of cyaneum: DuBois, 1986: 82.