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Worker, holotype: TL 5.2, HL 1.20, HW 1.07, ML 0.81, WL 1.66, scape L 1.08, eye L 0.17 mm; Cl 89, MI 68.
2. Mandibles long, but not quite as long relatively as in risiiHNS, which has MI 72-77 in the few samples examined. Denticles on mesal ventral margins of mandibles small and blunt, ordinarily hidden beneath edentate dorsal margin when head is viewed full-face.
3. Pronotal disc behind anterior transverse costulation is shining but thickly covered discad with fairly coarse, vermiculate, predominantly longitudinal rugulae or costulae. Sides of pronotum obliquely to vertically rugulo-striate more finely, except for a variable lower posterior section that tends to be smooth and shining. (Pronotal sculpture not shown in fig. 37). Mesonotum vaguely transversely rugulose, but longitudinally costulate behind, continuing into metanotal saddle (fig. 37). Mesopleura smooth and shining, except for striate posterior end.
4. Petiolar node in side view tapering evenly to a narrowly rounded summit (fig. 37); convex-sided in front view, then tapering to a rounded summit. Petiole with a longer anterior pedunculate section than in risiiHNS. Node (and gaster) smooth and shining.
Worker paratypes (4): TL 4.9-5.2, HL 1.13-1.22, HW 1.01-1.09, ML 0.78- 0.82, WL 1.53-1.70, scape L 1.01-1.09, eye L 0.16-0.20 mm; Cl 89, MI 67-69.
Intercalary tooth of mandibular apex (on ventral apical tooth) may be missing or nearly so, apparently due to wear or breakage; fine and acute in one young specimen. Pronotal sculpture variable in orientation on pronotum; in one worker the rugulae form a transverse band across the posterior end of the disc.
Queen, dealate: TL 5.6, HL 1.24, HW 1.16, ML 0.82, WL 1.76, scape L 1.09, eye L 0.27 mm; Cl 93, MI 66. Pronotum shining, transversely rugose or costate. Mesonotum smooth and shining. Frontal striation weak, fine, confined to space just inside frontal carinae; this striation more delicate in both worker and queen than in risiiHNS of corresponding castes. Petiolar node slightly thinner in side view than in workers; i.e., it is axially compressed, with anterior and posterior surfaces converging very gradually. Gaster larger than in worker.
Holotype (MCZ) and 4 paratype workers (MCZ, BMNH-London), plus one dealate queen, all labeled as from Mt. Makiling, near Los Bafios, Laguna Prov., Luzon, Philippines. A single paratype was collected (date not recorded) by F. X. Williams; the remainder of the specimens, including the holotype, came from two samples of leaf litter collected near the summit of the mountain in February and March 1968, run through the Berlese funnel by R. A. Morse.
Found most commonly in these habitats: 3 times found in Rainforest, 1 times found in Degraded coastal hill forest.
Found most commonly in these microhabitats: 1 times walking on log, 1 times On granite, 1 times litter near summit, berlesate, 1 times Ex rotting log.
Collected most commonly using these methods: 1 times hand collected.
Elevations: collected at 260 m
Type specimens: paratype: casent0217506