Stenamma wumengense

The only specimen of this species, the holotype worker, was collected while foraging on the ground in broadleaf forest.

Identification
Liu & Xu (2011) - This new species is close to Stenamma owstoni but head and scapes comparatively longer, with CI 79 and SI 1 03; eyes with only 4 ommatidia in the maximum diameter; mesopleura longitudinally rugose, propodeal dorsum retirugose; head and body reddish brown.

Distribution
Yunnan Province, China.

Distribution based on Regional Taxon Lists
Palaearctic Region: China.

Nomenclature

 *  wumengense. Stenamma wumengense Liu & Xu, 2011: 742, figs. 4-6 (w.) CHINA.

Worker
Holotype. TL 3.9, HL 0.95, HW 0.75, C l 79, SL 0.78, SI 103, PW 0.55, AL 1.20, ED 0.08, PL 0.50, PH 0.25, PI 50, DPW 0.19, PPL 0.33, PPH 0.24, PPI 73, PPW 0.25.

In full face view, head roughly rectangular, longer than broad. Occipital margin nearly straight, occipital corners roundly prominent, lateral sides weakly convex. Anterior margin of clypeus convex, and concave in the middle.

Mandibles with 2 distinct apical teeth and followed by 6 indistinct denticles. Antennae 12-segmented, scapes surpassed occipital corners by 1/15 of its length, antennal clubs 4-segmented. Eyes located before midpoints of lateral sides of head, with 4 ommatidia in the maximum diameter.

In profile view, promesonotum high, anterior portion roundly convex, middle portion relatively straight, posterior portion steeply sloped. Promesonotal suture absent. Metanotal groove narrow, shallowly depressed. Propodeum distinctly lower than promesonotum, dorsum straight and formed a gentle slope. Propodeal spines very short, acutely toothed, about l/6 length of declivity. Declivity straight, about 3/5 length of dorsum. Propodeal plates short and broad, nearly trapezoid, slightly longer than propodeal spines. Petiole long, length: height: width = 4: 2: 1.5, gradually thickened backwards. Petiolar node bluntly prominent at top, shorter than anterior peduncle, slightly depressed between them, but without distinct boundary line. Ventral face of petiole nearly straight, anteroventral corner bluntly angled. Postpetiolar dorsum roundly convex, length: height: width= 2: 1.5: 1.1, ventral face weakly concave, anteroventral corner extruding and tooth-like.

Mandibles finely longitudinally striate. Head retirugose, but longitudinally rugose before eyes and between frontal carinae. Median portion of clypeus smooth and shining. Dorsum of alitrunk retirugose. Pronotum with a longitudinal central carina. Lateral sides of alitrunk longitudinally rugose, but lateral sides of pronotum finely retirugose. Propodeal declivity smooth, upper portion sparsely transversely rugose. Fore coxae transversely rugose. Petiole and postpet iole with interweaved fine longitudinal rugae and fine punctures. Dorsum of petiolar peduncle with a fine longitudinal central carina. Gaster smooth and shining, basal carinae about 1/3 length of postpetiole.

Head with sparse erect to suberect hairs and dense decumbent pubescence. Alitrunk and petiole with sparse erect to suberect hairs and sparse decumbent pubescence. Postpetiole and gaster with abundant erect to suberect hairs and abundant decumbent pubescence. Dorsa of propodeum and petiolar peduncle without erect hairs. Antennal scapes and hind tibiae with dense decumbent pubescence, but without erect hairs. Head and body reddish brown, appendages and gaster yellowish brown, eyes and masticatory margins of mandibles black.

Type Material
Holotype: worker, CHINA: Yunnan Province, Yongshan County, Xisha Town, Xiaoyanfang, 2070m, forage on the ground in broad leaf forest, 2006. VII. 19, Zheng-Hui XU leg., No. A06-643. 

Etymology
The new species is named after the type locality Mt. Wumeng in northeastern Yunnan Province.

References based on Global Ant Biodiversity Informatics

 * Guénard B., and R. R. Dunn. 2012. A checklist of the ants of China. Zootaxa 3558: 1-77.
 * Liu X., and Z. H. Xu. 2011. Three New Species of the Ant Genus Stenamma (Hymenoptera: Formicidae) from Himalaya and the Hengduan Mountains With a Revised Key to the Known Species of the Palaearctic and Oriental Regions. Sociobiology 58: 733-748.