Polyrhachis dentihumera

The types were collected from seasonal rain forest and mountain rain forest.

Identification
Xu (2000) - Close to Polyrhachis gibba, but body surface densely punctured and dull, without metallic luster; shoulders of pronotum more protruding and formed a pair of acute teeth; petiolar node with lateral spines more stouter and straighter.

Distribution based on Regional Taxon Lists
Palaearctic Region: China.

Nomenclature

 *  dentihumera. Polyrhachis (Cyrtomyrma) dentihumera Xu, 2002b: 524, figs. 5-8 (w.q.) CHINA.

Worker
Holotype. TL 5.2, HL 1.55, HW 1.65, CI 106, SL 1.80, SI 109, PW 1.20, AL 1.80, ED 0.40, MTL 2.35. Head slightly broader than long, roughly triangular. Occipital margin weakly convex, occipital corner rounded. Lateral sides evenly convex. Mandible with 5 teeth. Clypeus weakly convex. without longitudinal central carina, anterior margin with a pair of small denticles and weakly emarginate between the denticles. Antennae long, scape surpassing occipital corner by about 3/5 of its length. Eyes close to occipital corners. In profile view, dorsum of alitrunk strongly convex, promesonotal suture distinct, metanotal groove absent. Propodeum unarmed, dorsum and declivity formed a single slope surface. In dorsal view, shoulders of pronotum form a pair of acute teeth. In front view, petiolar node with a pair of short lateral spines, laterodorsally pointed and slightly bent upward, without median teeth, dorsal margin nearly straight, with a notch in the center. In profile view, petiolar node triangular, lateeral spines bent backward. Mandibles finely and longitudinally striate, relatively dull. Head, alitrunk, petiole and gaster uniformly, densely and finely punctured, dull. Scapes and legs superficially, densely and finely punctured, less shiny. The whole body with abundant depressed short pubescence. Clypeus and vertex with sparse suberect hairs, ventral surface and apex of gaster with abundant suberect hairs, occiput, dorsum of alitrunk, petiole and dorsum of first gastral segment without hairs. Scapes, femora and tibiae with sparse depressed pubescence, without hairs. The whole body black, eyes brown, legs black, hairs white.

Paratypes. TL 5.0-6.2, HL 1.50-1.80, HW 1.65- 2.15, CI 110-119, SL 1.70- 2.15, SI 100-105, PW 1.20-1.45, AL 1.70-2.30, ED 0.40-0.50, MTL 2.30-2.85 (5 measured). As holotype, but in some individuals occiput and mesonotum with a pair of erect hairs separately.

Queen
Paratype dealate: TL 8.4, HL 2.15, HW 2.50, CI 116, SL 2.60, SI 104, PW 2.05, AL 3.10, ED 0.60, MTL 3.50 (1 measured). As holotype, but with body larger, head with 3 ocelli, shoulders of pronotum rounded, petiolar node with short tooth-like lateral spines.

Type Material
The type specimens are deposited in the Insect Collections, Faculty of Resources. Southwest Forestry College. Kunming. Yunnan Province, China.

Holotype: worker. No. A97-3140, 790m. Bubang Village, Mengla County, Yunnan Province, XII.13.1997, collected by Mr. Hu Gang in seasonal rain forest. Paratypes: 3 workers, with same data as holotype; 1 worker. No. A97-176, 1100 m. Longlin Village. Mengla County, Yunnan Province, III.5.1997, collected by Mr. Lai Yu-Chu in mountain rain forest; 2 workers. No. A97-3106, 1060 m. Longmen Village. Mengla county. Yunnan Province, XII.11.1997, collected by Mr. Yang Bi-Lun in mountain rain forest; 2 workers, with same data as No. A97-3106 but No. A97-3111; 1 dealate female, with same data as No. A97-3106, but No. A97-3165.

References based on Global Ant Biodiversity Informatics

 * Fontanilla A. M., A. Nakamura, Z. Xu, M. Cao, R. L. Kitching, Y. Tang, and C. J. Burwell. 2019. Taxonomic and functional ant diversity along tropical, subtropical, and subalpine elevational transects in southwest China. Insects 10, 128; doi:10.3390/insects10050128
 * Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
 * Ran H., and S. Y. Zhou. 2013. Checklist of Chinese Ants: Formicomorph Subfamilies ( Hymenoptera: Formicidae) (III). Journal of Guangxi Normal University : Natural Science Edition 31(1): 104-111.
 * Xu Z. H. 2002. A systematic study on the ant subgenus Cyrtomyrma Forel of the genus Polyrhachis Smith of China (Hymenoptera; Formicidae). Acta Entomologica Sinica 45(4): 522-530.
 * Xu Zheng-Hui. 2002. A systematic study on the ant subgenus Cyrtomyrma Forel of the genus Polyrhachis Smith of China (Hymenoptera; Formicidae). Acta Entomologica Sinica 45(4): 522-530.