Strumigenys omopyx

Identification
Bolton (2000) - Of the three species currently assigned to this group two, omopyx and Strumigenys rantan, lack pronotal humeral hairs whilst the third species, Strumigenys pallentra, has a short erect stiff simple hair at each humerus. S. omopyx has the longest scapes in the group, SI 82-83, as opposed to SI 68-69 in the other two species.

Separation of omopyx and rantan is best achieved by the characters given in the key. Beside these it is worth noting that the preocular impression is much more developed in omopyx, where it is a long sweeping concavity, than in rantan where it is scarcely more than a constriction of the margins in front of the eyes.

Distribution based on Regional Taxon Lists
Indo-Australian Region: Indonesia, Sulawesi.

Nomenclature

 *  omopyx. Strumigenys omopyx Bolton, 2000: 897, fig. 475 (w.) INDONESIA (Sulawesi).

Worker
Holotype. TL 3.0, HL 0.81, HW 0.63, CI 78, ML 0.40, MI 49, SL 0.52, SI 83, PW 0.33, AL 0.82. Preapical tooth small, at proximal end of concave section (apical quarter) of inner mandibular margin. Anterior clypeal margin with a broad V-shaped impression. Preocular impression in anteroventral margin of head long and broadly concave. In full-face view dorsolateral margin of head with 2-3 short stubby projecting hairs, anteriormost in apicoscrobal position; hairs directed more dorsally than laterally. With head in profile cephalic dorsum with about 6 pairs of short simple erect hairs; anteriormost hair is approximately at level of posterior margin of eye. Pronotal humeral hair absent, standing hairs absent from dorsum of pronotum; a single pair of short erect hairs present on mesonotum. Hairs on first gastral tergite simple and blunt apically, or somewhat flattened and feebly expanded toward the apex. Petiole node broader than long in dorsal view. Reticulate-punctate sculpture on disc of postpetiole partially effaced medially, not evenly densely sculptured across entire disc. Basigastral costulae shorter than disc of postpetiole.

Paratype. TL 3.0, HL 0.80, HW 0.62, CI 78, ML 0.40, MI 50, SL 0.51, SI 82, PW 0.33, AL 0.80.

Type Material
Holotype worker, Indonesia: Sulawesi Utara, G. Muajat, 1780 m., 25.i.1985 (no collector’s name). Paratype. 1 worker with same data as holotype. (BMNH).