Polyrhachis orbihumera

The types were collected from warm pine forest.

Identification
Xu (2000) - Close to Polyrhachis rastellata, but body surface densely, finely and superficially punctured, not smooth and less shiny; petiolar node with median teeth elongate and distinctly longer than lateral ones; tibiae blackish brown or black.

Distribution based on Regional Taxon Lists
Palaearctic Region: China.

Nomenclature

 *  orbihumera. Polyrhachis (Cyrtomyrma) orbihumera Xu, 2002b: 526, figs. 26-29 (w.q.) CHINA.

Worker
Holotype. TL 5.1, HL 1.50, HW 1.50, CI 100, SL 1.75, SI 117, PW 1.15, AL 1.80, ED 0.45, MTL 2.00. Head about as broad as long, roughly triangular. Occipital margin roundly convex, occipital corners rounded. Lateral sides weakly convex. Mandibles 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 the occipital corner by about 3/5 of its length. Eyes placed at the occipital corners. In profile view, dorsum of alitrunk strongly convex. Promesonotal suture distinct, metanotal groove absent. Propodeum unarmed, dorsum and declivity weakly depressed and separated by a blunt convex. In dorsal view, shoulders of pronotum rounded. In front view, petiolar node with lateral teeth short and rightly angled, median teeth elongate and acute, distinctly longer than the lateral ones. In profile view petiolar node triangular, median teeth slightly bent backward. Mandibles densely and finely striate and sparsely punctured, relatively dull. Head, alitrunk and petiole uniformly, densely and superficially punctured, less shiny, gaster with similar punctures but weaker and shiny. The whole body with sparse depressed short pubescence. Anterior part of head with sparse erect hairs, mesonotum with a pair of erect hairs, ventral face and apex of gaster with abundant suberect hairs. Occiput, pronotum, propodeum, petiole and dorsum of first gastral segment without erect hairs. Scapes, femora and tibiae with abundant depressed short pubescence, without erect hairs. Body black. femora and tarsi brownish red, tibiae blackish brown. Hairs light yellow.

Paratypes. TL 4.8-5.8, HL 1.40-1.70, HW 1.40- 1.75, CI 100-103, SL 1.65-1.95, SI 111-120, PW 1.00-1.35, AL 1.75-2.15, ED 0.45-0.50, MTL 1.95-2.35 (5 measured). As holotype, but in some individuals with tibiae black, or mesonotum without erect hairs.

Queen
Paratype dealate. TL 6.3, HL 1.70, HW 1.75, CI 103, SL 2.00, SI 114, PW 1.65, AL 2.60, ED 0.50, MTL 2.55 (1 measured). As holotype, but with body larger, head with 3 ocelli, petiolar node with shorter median teeth, about as long as lateral ones.

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

Holotype: worker, No. A98-59, 1270 m, Songshanling. Puwen Town, Jinghong County, Yunnan Province, III.4.1998, collected by Mr. He Yun-Feng in warm pine forest. Paratypes: 28 workers, with same data as holotype; 1 dealate female, with same data as holotype but No. A98-5I.

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.