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Worker. Length 3 1/2 lines.- - Ferruginous and very pubescent: the head very large, deeply emarginate behind and with a deeply impressed central channel, extending to the anterior margin of the face; the head and thorax closely and coarsely punctured, the latter narrowed behind, and deeply strangulated between the meso- and metathorax, the latter armed with two acute spines, and obliquely truncate. Abdomen ovate; the first segment with a number of fine longitudinal carinae, which intermingle at its base, but run parallel at its apex; the following segments more faintly carinate.
Type specimens: Holotype of Pheidole rugosa: casent0901525