We describe a new, black carpenter ant (Camponotus polymorphicus) from the high altitude and paramo in the Andes Mountains of Colombia. This species is unusual in that it is extremely variable in size. We separate the workers into majors, intermediates and minors. The females and males are dimorphic in size. This species is unlikely to be confused with any other species in the Neotropics. It is much shiner than most other species, and is additionally black in color. It has abundant, erect, golden hairs on the cheeks, clypeus and malar area, but is without erect hairs along the sides of the head or on the scapes. It is one of the few tropical species found at high elevations, the only other relatively common tropical Camponotus at such elevations is C. nitens, which is much smaller and has a heart-shaped head.
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