Key to Polyrhachis armata-group species

This worker key is based on: [[Media:Kohout 2008a.pdf|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. PDF]]

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

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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
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 * 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
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 * 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
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 * 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