Key to Solomon Island Polyrhachis Cyrtomyrma

This worker key is based on: Kohout, R. J. 2006b. Review of Polyrhachis (Cyrtomyrma) Forel (Hymenoptera: Formicidae: Formicinae) of Australia, Borneo, New Guinea and the Solomon Islands with descriptions of new species. Memoirs of the Queensland Museum. 52:87-146.

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• Polyrhachis
• Cyrtomyrma

1

• Dorsum of mesosoma more-or-less evenly convex in outline . . . . . 2

• Dorsum of mesosoma distinctly higher anteriorly, descending posteriorly in uneven, undulating outline . . . . . 4

2

return to couplet #1

• Propodeal dorsum with pair of small teeth or tubercles; propodeal declivity very steep, virtually vertical, weakly concave at base . . . . . Polyrhachis johnsoni

• Propodeal dorsum without teeth or tubercles; propodeal declivity oblique to main axis of body . . . . . 3

3

return to couplet #2

• Generally larger species (HL >1.68); petiole with well developed, acute, subequal spines . . . . . Polyrhachis fulakora

• Generally smaller species (HL <1.53); petiole rather narrow, almost parallel-sided, with short, tooth-like spines . . . . . Polyrhachis ugiensis

4

return to couplet #1

• Pronotal humeri distinctly angular or subangular . . . . . 5

• Pronotal humeri widely rounded . . . . . 6

5

return to couplet #4

• Propodeum with pair of acute spines; mesosoma in profile with pronotal dorsum distinctly higher than summit of mesonotum . . . . . Polyrhachis pacifica

• Propodeum without spines; mesosoma in profile with summit of mesonotum distinctly higher than pronotal dorsum . . . . . Polyrhachis undulata

6

return to couplet #4

• Promesonotal suture situated at bottom of deep impression; propodeum with short, acute, upturned appressed hairs . . . . . Polyrhachis emeryana

• Promesonotal suture not within impression; propodeum unarmed or, at most, with pair of very short spines or tuberculae; whole body covered with very abundant, short, erect, bristle-like hairs and rather short, decumbent hairs . . . . . Polyrhachis setosa