Pogonomyrmex sylvestris

Robert A. Johnson, 2015, A taxonomic revision of South American species of the seed-harvester ant genus Pogonomyrmex (Hymenoptera: Formicidae). Part I, Zootaxa 4029 (1), pp. 1-142 : 122

Pogonomyrmex sylvestris -group

Workers in the P. sylvestris -group are diagnosed by the following characters: (1) first gastral tergum lacking striae, (1) anteroventral margin of peduncle of petiole with acuminate spine, (2) in dorsal view, postpetiole triangular, longer than wide, (3) superior and inferior propodeal spines long, (4) in dorsal view, petiolar node elongate; in profile, petiolar node flattened with crest at anterior margin that is elevated above posterior surface, (5) eyes small, situated anterior to middle of head, (6) psammophore poorly-developed, consisting of numerous short hairs scattered across ventral side of head, (7) mesosoma with several or more long, flexuous hairs, (8) propodeal spiracles circular, and (9) anterior margin of clypeus with medial tooth, sometimes very small, indistinct. Queens are unknown for all species; males are known for only P. st efani.