Strumigenys horvathi group

Strumigenys horvathi group Bolton (2000)

Worker Diagnosis
Apical fork of mandible of 2 spiniform teeth. Three intercalary denticles between the apicodorsal and apicoventral teeth; upper may be vestigial and difficult to see. A single conical to spiniform preapical tooth present close to the apicodorsal tooth. Mandibles linear, the inner margin usually with a translucent cuticular crest or lamella that arises near the base and terminates just proximal of the preapical tooth. MI 30-55.

Anterior clypeal margin broad, transverse to very shallowly evenly concave.

Scape subcylindrical to slightly dorsoventrally flattened, but not greatly expanded; length short to moderate, SI 57-81.

Apical antennomere not strikingly attenuated basally nor narrowly constricted to its articulation with the preapical segment.

Ventrolateral margin of head almost straight to broadly shallowly concave in front of the eye but without a preocular notch. With head in profile postbuccal groove shallow to moderate, ventral surface posterior to it shallowly convex and without indentations or impressions.

Propodeal teeth subtended by a carina or moderate lamella.

Spongiform appendages of waist segments all present, usually lateral lobe of petiole small and slender, little more than a continuation of the posterior collar; a thin pad sometimes present at base of first gastral sternite.

Pilosity. Cephalic dorsum (sometimes also promesonotum) densely clothed with conspicuous ground-pilosity that may be broadly spatulate, broadly spoon-shaped or orbicular; usually without standing hairs anywhere. Dorsolateral margin of head without an apicoscrobal hair, with a uniform row of anteriorly curved spatulate to spoon-shaped hairs. Pronotal humeral hair present or absent. Pronotal dorsum without standing hairs. Mesonotum either without erect hairs or 1-3 short pairs present. First gastral tergite with numerous stiff suberect to erect hairs that are simple to remiform. Long filiform or flagellate hairs entirely absent; basitarsi without elongate erect hairs.

Sculpture. Head and alitrunk reticulate-punctate dorsally, the sculpture may be partially to mostly concealed by the dense ground-pilosity. Alitrunk sometimes with smooth areas laterally. Disc of postpetiole smooth to reticulate-punctate. Gaster unsculptured except for moderate basigastral costulae.