About Polyrhachis dives Smith, 1857
Across its broad geographic range, Polyrhachis dives is a morphologically stable species. Even individuals from distant locations show only a small number of insignificant morphological differences. That said, consistent minor morphological differences separate specimens from different regions. Specimens from Southeast Asia typically have a more deeply notched anterior clypeal margin, and their eyes only rarely extend past the lateral outline of the head. Most Southeast Asian specimens also have propodeal spine tips that curve outwards more distinctly, plus longer petiolar spines that curve somewhat downwards starting from their midlength. In comparison, specimens from Australia and New Guinea have an anterior clypeal margin that is only shallowly emarginated, and their eyes do extend past the lateral cephalic outline. In these individuals, the propodeal spines curve only weakly outwards, and the petiolar spines are slightly shorter and less curved.
