Proceratium longmenense

The type worker was collected in subtropical evergreen broadleaf forest.

Identification
Close to Proceratium zhaoi but central clypeal process wide and triangular, subpetiolar process posteriorly without pointed tooth, propodeal teeth extrudent. (Xu 2006)

Distribution based on Regional Taxon Lists
Palaearctic Region: China.

Nomenclature

 *  longmenense. Proceratium longmenense Xu, 2006: 154, figs. 14  16 (w.) CHINA.

Worker
Holotype. TL 3.2, HL 0.87, HW 0.73, CI 85, SL 0.50, SI 68, ML 0.40, ED 0.02, PW 0.52, AL 0.97, PL 0.35, PH 0.33, DPW 0.32. Head nearly square, slightly longer than broad. Occipital margin straight. Occipital corners rounded. Lateral sides weakly convex. Masticatory margins of mandibles with 4 teeth, which reduced in sized from apex to base. Frontal carinae straight, convergent forward. Anterior margin of clypeus with a wide and triangular projection in the middle. Antennae thick, with 12 segments. Apices of scapes reached to 4/5 of the distance from antennal socket to occipital corner. Eyes with only one facet. In profile view, dorsum of alitrunk complete and weakly convex. Promesonotal suture and metanotal groove vanished on dorsum. Posterodorsal corner of propodeum extrudent into a right-angled tooth. Lateral lobes of propodeum blunt and rounded. Petiole roughly triangular and included backward, anterior and dorsal faces convex, anterodorsal corner rounded, posterior face short and straight. Subpetiolar process small and nearly rectangular, ventral face straight, anteroventral corner rightly angled, posterventral corner bluntly angled. Constriction between the two basal segments of gaster distinct, second segment very large, apical three segments short and under the second one.

Mandibles finely longitudinally striate. Head, alitrunk, petiole, and gaster finely densely punctate and dim. Gastral segments 3-5 smooth and shining. Dorsum of whole body with sparse short erect hairs and dense decumbent pubescence. Erect hairs abundant on dorsum of alitrunk. Dorsal faces of scapes and tibiae with dense decumbent pubescence, but without erect hairs. The while body yellowish brown. Mandibles, antenna, legs, and apex of gaster brownish yellow.

Type Material
China: Yunnan Province, Kunming City, Xishan Mountain Forest Park, Longmen, subtropical evergreen broadleaf forest, 2050 m, 5.V.2001, leg. Zhenghui Xu, No. A00514.

Etymology
Named after the type specimen locality Longmen, a place of the Xishan Mountain Forest Park.