Key to Polyrhachis armata-group species

This worker key is based on: Kohout, R.J. 2008a. A review of the Polyrhachis ants of Sulawesi with keys and descriptions of new species (Hymenoptera: Formicidae: Formicinae). Memoirs of the Queensland Museum. 52:255-317.

Polyrhachis peregrina is known only from the queen caste and is not included in the following key.

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• Polyrhachis armata species-group
• subgenus Myrmhopla
• Polyrhachis

1

• Head, mesosoma and petiole deeply and coarsely foveolate-rugose . . . . . Polyrhachis armata

• Head, mesosoma and petiole reticulate-punctate or weakly and shallowly rugose-punctate . . . . . 2

2

return to couplet #1

• Dorsum of petiole medially with two short, acute, intercalary spines . . . . . 3

• Dorsum of petiole medially with only vague rudimentary tuberculae . . . . . Polyrhachis nudata

3

return to couplet #2

• Propodeal spines virtually subparallel; whole body with distinct pile of pale-golden appressed pubescence . . . . . Polyrhachis aberrans

• Propodeal spines strongly diverging; whole body with rather diluted, silvery-white appressed pubescence . . . . . 4

4

return to couplet #3

• Larger species (HL >1.95); pronotal spines massive, strongly curved downwards . . . . . Polyrhachis strictifrons

• Smaller species (HL <1.65); pronotal spines horizontal, rather broad, but not massive . . . . . 5

5

return to couplet #4

• Eyes rather flat; pronotal spines short, hardly longer than width at base; pronotal dorsum between spines distinctly rugose-punctate . . . . . Polyrhachis diaphanta

• Eyes convex; pronotal spines more slender, almost twice as long as width at base; pronotal dorsum uniformly and finely reticulate-punctate . . . . . Polyrhachis saevissima