Key to Australian and Melanesian Probolomyrmex species

The following key to Australian and Melanesian Probolomyrmex species is based on Shattuck, Gunawardene & Heterick (2012 ).

1

 * Petiolar node relatively long and narrow (best viewed dorsally), the dorsal face (in side view) uniformly convex and without a separation of the anterior and dorsal faces; scape relatively long, greater than half length of head (SI > 95, Fig. 7b) => 2


 * Petiolar node relatively short and broad and with the anterior and dorsal faces separated by a convexity; scape relatively short, less than half length of head (SI < 92, Fig. 7b) => 5



2

 * Subpetiolar process reduced to a shallow convexity => Probolomyrmex newguinensis


 * Subpetiolar process well developed and box-like => 3

3

 * Posteroventral tooth of the subpetiolar process forming a 90° angle; body larger (HL > 0.59mm, HW > 0.38mm) (Australia) => Probolomyrmex aliundus


 * Posteroventral tooth of the subpetiolar process tooth-like; body smaller (HL < 0.59mm, HW < 0.38mm) (Papua New Guinea and Solomon Islands) => 4

4

 * Anteroventral tooth of the subpetiolar process broadly rounded); posterior face of propodeum with lateral flanges weakly developed; foveae on mesosoma and gaster more strongly developed (Solomon Islands) => Probolomyrmex salomonis


 * Anteroventral tooth of the subpetiolar process narrow and tooth-like; posterior face of propodeum with lateral flanges well developed (Fig. 6B); foveae on mesosoma and gaster weakly developed (Papua New Guinea) => Probolomyrmex simplex

5

 * Body smaller (HW < 0.33mm (Fig. 7a), ML < 0.65mm), head narrower (CI < 66, Fig. 7a) (northern Australia) => Probolomyrmex latalongus


 * Body larger (HW > 0.35mm (Fig. 7a), ML > 0.65mm), head broader (CI > 66, Fig. 7a) (south-eastern Australia) => Probolomyrmex greavesi