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Types Mus. Civ. Stor. Nat. Genova; possibly also Mus. Comp. Zool. Harvard (see Figure caption above). Etymology L crassicornisHNS, thick horn, referring to the expanded basal part of the antennal scape. diagnosis a member of the crassicornisHNS group distinguished by the following combination of traits.
Major: thickened basal portion of scape strongly curved toward the insertion, as illustrated; pilosity very sparse, usually almost absent from the head and gaster; humerus subangulate in dorsal-oblique view; pronotal dorsum marginally carinulate. Minor: all of dorsal surface of head except middle of clypeus and frontal triangle, as well as all of mesosoma and waist, foveolate and opaque.
Measurements (mm) Major (Belmont, North Carolina): HW 1.30, HL 1.30, SL 0.78, EL 0.20, PW 0.64. Minor (Belmont, North Carolina): HW 0.62, HL 0.74, SL 0.84, EL 0.10, PW 0.44. color Major: concolorous brownish yellow. Minor: concolorous yellowish brown.
Range North Carolina to northern Florida and west to western Texas.
Biology In northern Florida, Naves (1985) found the species sympatric with diversipilosaHNS, nesting in deep soil in forest clearings. The inconspicuous nest openings were never surrounded by craters of excavated soil of the kind common in other soil-dwelling species of PheidoleHNS, and the vertical galleries ran at least 60 cm deep. Minors and occasionally majors foraged 4 meters or more from the nest entrances, and minors were observed retrieving live termites and small dead arthropods. In western Texas, Moody and Francke (1982) found colonies at 100-1700 m, nesting under stones and in open soil.
Figure Upper: major. Lower: minor. NORTH CAROLINA: Belmont, Gaston Co., near Charlotte. (Labeled to species by Carlos Emery and likely part of his type series; the type locality is Charlotte.) Scale bars = 1 mm.
Found most commonly in these habitats: 1 times found in grass, 1 times found in secondary veg., thornscrub, pasture, 1 times found in secondary vegetation, 0 times found in open wooded area near spring fed lake.
Found most commonly in these microhabitats: 2 times pitfall trap.
Collected most commonly using these methods: 2 times pitfall.
Elevations: collected from 10 - 1158 meters, 693 meters average