Key to Australian Polyrhachis (Myrma) species

The following key to Australian Polyrhachis (Myrma) species (based on the worker caste) is modified from Kohout (2012 ).

1

 * Mesosoma in profile evenly convex, without distinct ridge-like border between dorsum and propodeal declivity; head with distinct postocular carinae; antennal scapes relatively long (SL >180) (P. continua-group) => Polyrhachis inusitata
 * Mesosoma in profile with more-or-less distinct border dividing dorsum from rather abrupt declivity (e.g. Fig. 1G); head without postocular carinae; antennal scapes relatively shorter (SL <170) (P. relucens-group) => 2

2

 * Petiolar spines arising from dorsolateral angles of node, widely separated by transversely convex dorsum => Polyrhachis foreli
 * Petiolar spines arising sublaterally from dorsal edge of node, situated relatively closer together => 3

3

 * Propodeal dorsum transversely narrow, concave, with lateral margins forming vertically raised laminate flanges; antennal scapes with numerous short erect hairs => Polyrhachis rufofemorata
 * Propodeal dorsum relatively wide, virtually flat, with lateral margins distinct, but not laminate; antennal scapes without erect hairs => Polyrhachis andromache