Formica lasioides

This is a common species, which nests in the soil, usually under stones or logs.

Identification
A small Formica with its entire surface smooth and polished. The pronotum has 10 or more erect hairs and the scape has numerous, short, delicate, white hairs. Most other body parts are covered with bristly hairs. (Mackay and Mackay 2002)

Distribution
Widespread in North America.

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

Habitat
In New Mexico (Mackay and Mackay 2002) - Primarily pine forest, ponderosa pine-riparian, fir forests, spruce and aspen forests, pinyon pine, oak forest, although it occurs in other habitats, including semiarid grasslands.

Biology
For New Mexico (Mackay and Mackay 2002) - Brood was collected in nests in July and August. Two dealate females were collected on the soil surface on 6 Aug. 1986. It nests together (possibly enslaved by) with Formica occulta. One colony was nesting together with Lasius pallitarsis, several nests contained colonies of Leptothorax crassipilis. One mixed nest included F. argentea, F. aserva, F. obtusopilosa, F. rubicunda, F. lasioides and Myrmica. These ants are docile, and escape when the nest is excavated.

Nevada, Wheeler and Wheeler (1986) - In Nevada lasioides is well scattered throughout the state, although most (87%) of the records are above 6,000 ft. We have 79 records for this species from 56 localities; 3,800-10,900 ft. Of these records 4 were in the Alpine Biome, 40 in the Coniferous Forest Biome, 8 in the Pinyon-Juniper, and 16 in the Cool Desert (3 in sand dunes and 1 in a disturbed area). Of the nests for which we have descriptions, the majority were under stones; those exposed were surmounted by a low irregular messy pile of soil, which in some cases resembled a crater; such structures ranged from 4 to 30 cm in diameter. This is a rapid-moving and timid species, but residents of populous colonies are sometimes aggressive and their bites are annoying.

Formica pergandei is a host for the following species slave-making species:

It is also a host for the temporary parasite.

Nomenclature

 *  lasioides. Formica lasioides Emery, 1893i: 664 (w.) U.S.A. Combination in Proformica: Emery, 1912f: 100; in Formica (Proformica): Wheeler, W.M. 1913f: 539; in Formica: Francoeur, 1973: 114. Subspecies of fusca: Wheeler, W.M. 1908g: 409; of neogagates: Wheeler, W.M. 1913f: 539. Revived status as species and senior synonym of vetula: Creighton, 1950a: 457.
 * picea. Formica lasioides var. picea Emery, 1895c: 335 (w.) U.S.A. [Junior primary homonym of picea Leach, 1825: 292, above.] Replacement name: vetula Wheeler, W.M. 1912c: 90.
 * vetula. Formica lasioides var. vetula Wheeler, W.M. 1912c: 90. Replacement name for picea Emery, 1895c: 335. [Junior primary homonym of picea Leach, 1825: 292.] Wheeler, W.M. 1917a: 554 (q.). Combination in F. (Proformica): Wheeler, W.M. 1913f: 540. Subspecies of neogagates: Buren, 1944a: 308. Junior synonym of lasioides: Creighton, 1950a: 458.

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