Formica ravida

Identification
The tentorial pits of this species are shallow. The erect bristles on the tibiae are restricted to two rows on the flexor surface, which extend nearly the entire length of the tibiae. The erect hairs on the gaster are scattered, and do not form an even vestiture when viewed in profile, although the gaster is covered with dense, gray, appressed pubescence. The petiole is narrow in profile with a moderately sharp apex (MacKay & MacKay 2002). There are several short erect hairs coming out of the compound eyes.

Distribution
This taxon was described from the United States. This ant is found in Canada British Colombia, California, Montana, Idaho, Washington, Dakota, Colorado, Arizona and New Mexico (Navajo Reservation).

Nomenclature

 * haemorrhoidalis. Formica rufa subsp. haemorrhoidalis Creighton, 1940a: 1, fig. 1 (w.) U.S.A. [First available use of Formica rufa subsp. integra var. haemorrhoidalis Emery, 1893i: 652 (w.); Wheeler, W.M. 1913f: 441 (q.m.); unavailable name.] [Junior primary homonym of Formica haemorrhoidalis Latreille, 1802c: 276, above.] Replacement name: ravida Creighton, 1940a: 1 (designated first available replacement name by Bolton, 1995b: 202, as haemorrhoidalis Creighton was raised to species and made senior synonym of ravida and tahoensis by Brown, 1965d: 181).
 *  ravida. Formica rufa subsp. ravida Creighton, 1940a: 1, fig. 1 (w.q.m.) U.S.A. [First available use of Formica truncicola subsp. integroides var. ravida Wheeler, W.M. 1913f: 560; unavailable name.] Subspecies of obscuripes: Creighton, 1950a: 493. Junior synonym of haemorrhoidalis Creighton: Brown, 1965d: 181. [F. haemorrhoidalis Creighton, 1940a: 1, junior primary homonym of F. haemorrhoidalis Latreille, 1802c: 276.] F. ravida designated as first available replacement name and senior synonym of tahoensis: Bolton, 1995b: 202.
 * tahoensis. Formica rufa subsp. tahoensis Creighton, 1940a: 1, fig. 1 (w.q.) U.S.A. [First available use of Formica truncicola subsp. integroides var. tahoensis Wheeler, W.M. 1917a: 538; unavailable name.] Cole, 1956g: 260 (q.m.). Subspecies of integra: Creighton, 1950a: 488. Junior synonym of haemorrhoidalis: Brown, 1965d: 181; of ravida: Bolton, 1995b: 205.

Additional References

 * [[Media:Brown 1965d.pdf|Brown, W. L., Jr. 1965d. Studies on North American ants. I. The Formica integra subgroup. Entomol. News 76: 181-186 PDF]]