A common and wide ranging species that exhibits regional variation in its nesting and habitat preferences. In New England, it is a subterranean ant which nests under rocks in open habitats and dry woodlands (Ellison et al., 2012). It is a generalist predator that also tends root aphids and feeds on their honeydew. Mating flights occur in late August and early September.
|At a Glance||• Polygynous|
This is a yellow or pale brown species, with a small eye (fewer than 35 ommatidia). The apex of the petiole is either straight or slightly concave. The hairs on the scapes and tibiae are decumbent or appressed (possibly 1 or 2 suberect hairs). The last segment of the maxillary palp is about as long (or shorter) than the penultimate segment. (United States: Mackay and Mackay 2002)
Ellison et al., (2012) - This is one of two New England species of Lasius with very tiny eyes; the other is Lasius nearcticus. These two species nest in distinct habitats – L. flavus in open, dry habitats and L. nearcticus in moist forests – but they can be distinguished reliably only by examining their maxillary palps at 25 – 50× magnification under a dissecting microscope. In L. flavus, the last (terminal) segment of the palp is shorter than the next-to-last (penultimate) segment, whereas in L. nearcticus, the terminal segment of the palp is longer than the penultimate segment.
Keys including this Species
This species is abundant in the eastern United States, but it is rare in the Gulf Coast states. It has been collected occasionally in the northern Rocky Mountains, the Chiricahua Mountains of southeast Arizona, and the Pacific Northwest. It is widespread in New England (Ellison et al., 2012).
Distribution based on Regional Taxon Lists
Distribution based on AntMaps
Distribution based on AntWeb specimens
Check data from AntWeb
In New Mexico (Mackay and Mackay 2002) this species nests under stones. Reproductives were found in the nest in mid August. It tends aphids, especially on the roots of grasses. Occurs in grasslands and mixed deciduous forest to ponderosa pine-riparian.
The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.
- brevicornis. Lasius brevicornis Emery, 1893i: 639, pl. 22, fig. 22 (w.q.m.) U.S.A.
- [Note: type-locality designated as District of Columbia by Creighton, 1950a: 421.]
- Combination in Lasius (Formicina): Wheeler, W.M. 1916k: 172; Wheeler, W.M. 1917i: 463.
- Combination in Lasius (Lasius): Emery, 1925b: 231.
- Junior synonym of flavus: Wilson, 1955a: 112; Smith, D.R. 1979: 1437.
- Status as species: Wheeler, W.M. 1904e: 305; Wheeler, W.M. 1905f: 396; Wheeler, W.M. 1906b: 13; Wheeler, W.M. 1908f: 623; Wheeler, W.M. 1910g: 569; Wheeler, W.M. 1916k: 172; Wheeler, W.M. 1916m: 593; Wheeler, W.M. 1917a: 526; Wheeler, W.M. 1917i: 463; Emery, 1925b: 231; Smith, M.R. 1930a: 5; Smith, M.R. 1931a: 23; Wheeler, W.M. 1932a: 17; Menozzi, 1932b: 311; Cole, 1936a: 37; Wing, 1939: 164; Wesson, L.G. & Wesson, R.G. 1940: 100; Wheeler, G.C. & Wheeler, E.W. 1944: 252; Buren, 1944a: 296; Creighton, 1950a: 421; Smith, M.R. 1951a: 851; Schar et al., 2018: 6.
- Ellison, A.M., Gotelli, N.J., Farnsworht, E.J., Alpert, G.D. 2012. A Field Guide to the Ants of New England. Yale University Press, 256 pp.
- Emery, C. 1893k. Beiträge zur Kenntniss der nordamerikanischen Ameisenfauna. Zool. Jahrb. Abt. Syst. Geogr. Biol. Tiere 7: 633-682 (page 639, pl. 22, fig. 22 worker, queen, male described)
- Mackay, W. P. and E. Mackay. 2002. The ants of New Mexico (Hymenoptera: Formicidae). Edwin Mellen Press, Lewiston, NY.
- Schar, S., Talavera, G., Espadaler, X., Rana, J.D., Andersen, A.A., Cover, S.P., Vila, R. 2018. Do Holarctic ant species exist? Trans-Beringian dispersal and homoplasy in the Formicidae. Journal of Biogeography, 2018;1–12 (doi:10.1111/jbi.13380).
- Wilson, E. O. 1955a. A monographic revision of the ant genus Lasius. Bull. Mus. Comp. Zool. 113: 1-201 (page 112, Junior synonym of flavus)