Strumigenys rohweri

Smith reported the types were from a colony of 75 - 100 workers and a number of dealate queens nesting in the soil under a rock.

Identification
Bolton (2000) - A member of the clypeata group. P. rohweri is closely related to Strumigenys clypeata but the latter does not have the striking clypeal pilosity of the former. Apart from this the hairs on the lateral clypeal margins of clypeata project out from the margin and curve anteriorly, and are distinctly longer and broader than the hairs anywhere on the dorsum. The dorsolateral cephalic margins and dorsum near the occipital margin have projecting long flagellate hairs in clypeata, and the fully closed mandibles have a small but obvious basal gap between anterior clypeal margin and basal tooth. In rohweri flagellate hairs are entirely absent from the head and the mandibles at full closure do not have a basal gap.

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

Nomenclature

 *  rohweri. Strumigenys (Cephaloxys) rohweri Smith, M.R. 1935: 214 (w.) U.S.A. Combination in S. (Trichoscapa): Smith, M.R., 1947f: 587; Creighton, 1950a: 309; in Smithistruma: Smith, M.R., 1951a: 828; Brown, 1953g: 57; in Pyramica: Bolton, 1999: 1673; in Strumigenys: Baroni Urbani & De Andrade, 2007: 126. See also: Bolton, 2000: 107.

Worker
Bolton (2000) - TL 2.2-2.3, HL 0.60-0.62, HW 0.39-0.40, CI 63-67, ML 0.07, MI 11-13, SL 0.32, SI 80-82, PW 0.26-0.27, AL 0.58-0.60 (3 measured). When mandibles fully closed there is no gap between basal tooth and anterior clypeal margin. In full-face view dorsum of clypeus densely clothed with appressed broad scale-like hairs; hairs densest anteriorly where they are smaller and almost overlap; more posteriorly the hairs are larger, about as broad as long and narrowly separated. Lateral clypeal margins in full-face view with similar hairs that are curved anteriorly and very closely appressed to the surface. Anterior clypeal margin broadly and evenly shallowly convex, difficult to see because overlapped by the very dense scale-like hairs. Lateral clypeal margins shallowly convex and concealing outer margins of mandibles. In profile lateral and anterior margins of clypeus narrowly but distinctly bimarginate, the upper margin slightly more prominent than the lower and the two separated by a shallow peripheral groove; lower margin not visible in full-face view. Cephalic dorsum behind clypeus with ground-pilosity broadly spatulate, especially in the apical halves. Head entirely lacking simple or flagellate projecting hairs on the dorsum and the dorsolateral margins. Alitrunk with narrowly spatulate ground-pilosity. Pronotum with flagellate humeral hair, a pair of flagellate hairs on pronotal dorsum and a pair on the mesonotum. Flagellate hairs are also present on the first gastral tergite and on the dorsal (outer) surfaces of the hind tibia and basitarsus.

Type Material
Bolton (2000) - Lectotype worker (by designation of Brown, 1953a: 58) and paralectotype workers, U. S. A. Mississippi, Holly Springs (L. C. Murphree) [examined].

References based on Global Ant Biodiversity Informatics

 * Annotated Ant Species List Ordway-Swisher Biological Station. Downloaded at http://ordway-swisher.ufl.edu/species/os-hymenoptera.htm on 5th Oct 2010.
 * Brown W. L., Jr. 1953. Revisionary studies in the ant tribe Dacetini. Am. Midl. Nat. 50: 1-137.
 * MacGown J. A., J. G. Hill, and R. L. Brown. 2010.  Native and exotic ant in Mississippi state parks.  Proceedings:  Imported Fire Ant Conference, Charleston, South Carolina, March 24-26, 2008: 74-80.