Stigmatomma kangba

The types were collected from forest soil samples. Nothing else is known about the biology of .

Identification
This new species is close to Stigmatomma rubiginoum but in full-face view, occipital margin widely weakly concave, occipital corners bluntly angled; in profile view, subpetiolar process roughly square.

Distribution based on Regional Taxon Lists
Palaearctic Region: China.

Castes
Known only from the worker caste.

Nomenclature

 * . Amblyopone kangba Xu & Chu, 2012: 1187, figs. 13-15 (w.) CHINA (Tibet, Yunnan).
 * Type-material: holotype worker, 4 paratype workers.
 * Type-locality: holotype China: Tibet, Zayu County, Zhuwagen Town, Cibaqiao, 1750 m., 30.viii.2010, No. A10-3405, soil sample, Pinus yunnanensis forest (X. Liu); paratypes: 2 workers with same data, 2 workers China: Yunnan Prov., Xichou County, Xisa Town, Jiaokui Village, 1480 m., 31.iii.2010, No. A10-1763, Cyclobalanopsis glaucoides forest (Z. Xu).
 * Type-depository: SFCY.
 * Combination in Stigmatomma: Yoshimura & Fisher, 2014: 15 (in text).
 * Distribution: China.

Worker
TL 6.7, HL 1.40, HW 1.40, CI 100, SL 0.80, SI 57, ED 0.10, ML 1.17, PW 0.93, AL 2.07, PL 0.70, PH 0.87, DPW 0.80, LPI 124, DPI 114.

In full-face view, head square, as broad as long, slightly widened forward. Occipital margin weakly widely concave, occipital corners bluntly angled. Lateral sides nearly straight. Anterolateral corners each with a reduced tiny tooth. Mandibles elongate and linear, masticatory margin very short, about 1/4 length of the inner margin, with 3 simple teeth; inner margin with 2 rows of curved teeth, each row with 6 teeth, the basal tooth large and triangular. Middle portion of anterior clypeal margin weakly protruding forward, slightly concave, with 4 tiny short rectangular denticles; anterolateral corners rightly angled. Frontal lobes slightly surpassed anterior clypeal margin. Antennae short, 12-segmented; apices of scapes reached to 2/3 of the distance from antennal sockets to occipital corners; funiculi incrassate toward apices. Eyes small, located behind the midpoints of the lateral sides of head, each with about 9 facets.

In profile view, dorsum of alitrunk weakly convex, promesonotal suture distinctly notched. Mesonotum short and convex. Metanotal groove absent. Dorsum of propodeum nearly straight, about 1.5 times as long as declivity, posterodorsal corner rounded, declivity weakly convex. Dorsal face of petiole weakly convex, anterior face straight, anterodorsal corner bluntly angled; ventral face oblique and weakly concave, subpetiolar process roughly square, with a circular sub-transparent fenestra. Constriction between the two basal gastral segments distinct, sting strong and extruding.

In dorsal view, mesothorax constricted, mesonotum very short. Propodeal declivity weakly concave. Petiole broader than long, width : length = 1.2:1.

Mandibles longitudinally striate. Head with fine elongate reticulations. Dorsal faces of alitrunk, petiole, and gaster sparsely punctured, the punctures decreased in diameter from alitrunk to gaster, interfaces smooth and shining. The longitudinal middle strip of pronotum without punctures. Lateral sides of alitrunk, petiole, and gaster densely punctured; lateral sides of mesothorax and metathorax longitudinally striate. Dorsal surfaces of head and body with abundant suberect short hairs and dense decumbent pubescence. Scapes and hind tibiae with sparse suberect hairs and dense decumbent pubescence. Color reddish brown. Occiput blackish brown. Antennae and legs yellowish brown.

Paratype: TL 6.5-7.0, HL 1.33-1.40, HW 1.33-1.40, CI 100-102, SL 0.77-0.83, SI 57-60, ED 0.07-0.08, ML 1.17-1.23, PW 0.87-0.97, AL 1.93-2.07, PL 0.67-0.77, PH 0.87-0.90, DPW 0.78-0.83, LPI 117-130, DPI 109-118 (4 individual measured). As holotype, but middle portion of anterior clypeal margin with 4-6 tiny rectangular denticles; Color yellowish brown to reddish brown.

Type Material
Holotype: worker, China: Tibet, Zayu County, Zhuwagen Town, Cibaqiao, 1750m, 2010.VIII. 30, collected from a soil sample in the forest of Pinus yunnanensis (Pinaceae), Xia Liu leg., No.A10-3405. Paratypes: 2 workers, with the same data as holotype; 2 workers, China: Yunnan Province, Xichou County, Xisa Town, Jiaokui Village, 1480m, 2010. III.31, collected from a soil sample in the forest of Cyclobalanopsis glaucoides (Fagaceae), Zheng-Hui Xu leg., No.A10-1763.

Etymology
The new species is named after a race of the Tibetan people “Kangba” who live in the southwestern Tibet.

References based on Global Ant Biodiversity Informatics

 * Xu Z.-H., and J. J. Chu. 2012. Four New Species of the Amblyoponine Ant Genus Amblyopone (Hymenoptera: Formicidae) from Southwestern China with a Key to the Known Asian Species. Sociobiology 59(4): 1175-1196.