Strumigenys filirrhina

Brown (1964) - This species was described from a single worker taken in pine-holly leaf mold in North Carolina. Since then, I have examined a series of workers from Tryon, North Carolina, in leaf mold (L. Eisenach leg.); and a single worker from Champion Springs, Annapolis, Missouri (G. A. Ulrich leg.).

Identification
Bolton (2000) - A member of the clypeata group. Only filirrhina and Strumigenys bimarginata of the entire Nearctic fauna have the strongly bimarginate clypeus discussed under the introduction to the group. The described differences in clypeal and cephalic pilosity quickly separate the two.

Distribution based on Regional Taxon Lists
Nearctic Region: United States.

Nomenclature

 *  filirrhina. Smithistruma (Smithistruma) filirrhina Brown, 1950b: 37 (w.) U.S.A. Combination in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 120. See also: Brown, 1953g: 63; Bolton, 2000: 104.

Worker
Bolton (2000) - TL 2.0-2.2, HL 0.56-0.58, HW 0.38-0.40, CI 67-69, ML 0.08-0.09, MI 16-20, SL 0.27-0.29, SI 69-73, PW 0.24-0.26, AL 0.52-0.55 (3 measured).

Clypeus in full-face view distinctly bimarginate around its entire anterior and lateral borders; the two margins concentric, the outer (lower) margin in this view projects out beyond the inner (upper) margin. In profile the upper and lower margins seen to be separated by a marked concave peripheral groove or gutter. Hairs on anterior and lateral upper clypeal margin fine and filiform. At least the pair closest to the midline curved weakly away from the midline; frequently others or most marginal hairs so oriented. Dorsum of clypeus immediately behind margin with a series of curved hairs that arise from very conspicuous pits. Dorsum of clypeus in profile with a pair of extremely long erect flagellate hairs that arise in front of the antennal socket. Dorsolateral margin of head with 2 (rarely 3) pairs of flagellate hairs; the apicoscrobal hairs freely project laterally but the more anterior hairs seem usually to be more erect. Ground-pilosity of head very fine, in full-face view conspicuously curved toward the midline. A pair of flagellate hairs present on cephalic dorsum close to occipital margin; a pair on dorsum of pronotum and another on mesonotum. Sparse flagellate hairs present on first gastral tergite, especially anteriorly.

Type Material
Bolton (2000) - Holotype worker, U. S. A. North Carolina, Williamston, 17.xii.1946, pine-holly leaf mould (D.L. Wray) [examined].