Pachycondyla stigma
Not considered a significant pest species.
Diagnosis of worker among Antkey species. Antenna 12-segmented. Antennal scapes exceed posterior head margin. Anterior margin of clypeus not denticulate. Eyes small (less than 5 facets); situated distinctly below midline of head. Frontal lobes relatively broad. Clypeus with anterior margin flat to convex, but never forming a distinct triangle that projects anteriorly beyond the base of the mandibles. Mandibles triangular; with 5 teeth. Metanotum does not form a prominent convexity bordered by distinct suture lines. Hind tibia with both pectinate spur and simple spur. Tarsal claws lacking subapical tooth, hind coxae lacking dorsal spine. Waist 1-segmented. Petiole narrowly attached to gaster with conspicuous posterior face. Gaster armed with sting. Abdominal segment 4 lacking deep longitudinal furrows. Distinct constriction between abdominal segments 3+4. Color reddish brown to reddish black with brownish red appendages.
Pachycondyla stigma is easily distinguished from species of Anochetus, Odontomachus and Leptogenys by its triangular mandibles. Among species of Hypoponera and Ponera that are introduced to or commonly intercepted in the United States, P. stigma can be distinguished by its mandibles which have exactly 5 teeth (versus more than 7), it broader frontal lobes, and by its hind tibia that has both a pectinate spur and simple spur (versus only a simple spur). Pachycondyla stigma can be distinguished from P. chinensis by its smaller eyes (less than 6 facets versus more than 6 facets in P. chinensis) and its mandibles (5 teeth versus 7 teeth in P. chinensis).