Camponotus laevigatus

Camponotus laevigatus is less common than other forest dwelling North American carpenter ants that have both large colonies and large soldiers. The size of mature colonies is uncertain. A single nest collected in Washington state was estimated to contain about 1,000 individuals but Akre et al. (1994) speculated that colonies may contain ten to twenty times as many workers. Individuals forage during the day and do not use regular trails (Hansen and Akre 1985).

Identification
This species is easily separated from all other North American Camponotus species by the majors, minors, females, and males being shiny black and having short, bristly hairs on the antennal scapes as well as other body parts. The males may be easily recognized by the abundant, white, erect hairs on many body parts including the head, scape, mesosoma, petiole, gaster, and tibiae. (Mackay and Mackay 2002)

The workers are polymorphic, with a large soldier caste.

Distribution
Canada, United States, Mexico. Montana west to British Colombia, south to California and Baja California Norte, and east to New Mexico.

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

Biology
Gregg (1963) reports from Colorado: "..this species is closely associated with wooded and forested areas and forest margins, not being found at any great distances from them in open habitats. It requires rotting logs in various degrees of decomposition, especially the early stages, although if more records were available the ant might be seen to utilize a greater assortment of decaying woods. My general impression is that laevigatus shows a preference for rather sound pine logs in the second to third stages of disintegration."

Mackay and Mackay (2002) - Deciduous forests, oak forests (Gamble), pinyon-juniper, fir and pine forests at higher elevations or latitudes, 2130 - 2447 meters in elevation. Nests are occasionally found in urban areas. Camponotus laevigatus is a forest species that nests in rotten logs and stumps. It is an occasional pest in buildings.Brood was found in nests in August, new nests were established in August. They are prey of Pogonomyrmex montanus in southern California.

Nomenclature

 *  laevigatus. Formica laevigata Smith, F. 1858b: 55 (w.q.) U.S.A. Wheeler, W.M. 1910d: 327 (s.m.); Wheeler, G.C. & Wheeler, J. 1968: 216 (l.). Combination in Camponotus: Roger, 1863b: 5; in C. (Camponotus): Forel, 1914a: 266. See also: Mayr, 1886d: 420.

Etymology
Morphological. laevigatus means smooth or slippery and this describes the ant's shiny integument.