Strongylognathus tylonus

The lone type, a worker, was collected in a grassland adjacent to a river.

Identification
Wei et al. (2001) - Resembles Strongylognathus karawajewi but mandible with four minute tuberculi on the outer margin; propodeum with a pair of very blunt dentes; subpetiolar process absent; superior surface of petiolar node straight.

Distribution based on Regional Taxon Lists
Palaearctic Region: China.

Nomenclature

 *  tylonus. Strongylognathus tylonum Wei, Xu & He, 2001: 69, figs. 1, 2 (w.) CHINA.

Worker
(Holotype): TL 3.10, HL 1.02, HW 0.92, CI 90, SL 0.64, SI 68, PW 0.72, AL 1.00, PNL 0.58, ED 0.20.

Head rectangular, longer than broad. Occipital border broadly concave in the middle, with occipital corners somewhat elongated backwards. Mandibles falcate, without subapical teeth, but each has four minute tuberculi on outer margin. Clypeus convex and narrow, with weakly concave anterior broder. Frontal lobes weakly developed, partly covering the antennal insertions. Eyes small, situated just in the middle of the sides. Antennal scapes short, not reaching to occipital corners and antennal club 3-segmented.

Alitrunk fused, with promesonotal suture and metanotal groove unconspicuous. Propodeum with a pair of very blunt dentes.

Petiolar node cuneate, with a straight superior surface. Subpetiolar process absent. Postpetiolar node orbiculate, subequal to petiolar node and obviously lower than the petiolar one.

Gaster compressed dorsoventrally in lateral view, oval.

Body smooth and shining. Punctures very sparse. Anterior margin of clypeus, outer margins of mandibles, frontal lobes and dorsa of nodes separately possessing several long standing hairs. Hairs on alitrunk very sparse. Suberect long hairs on gaster relatively rich. Antennaw and legs with abundant pubescences. Body with sparse pubescences. Hairs golden yellow. Pubescences yellow.

Color dominantly shining yellow. Head and gaster brownish yellow.

Type Material
The type-specimens of the new species is deposited in the Insect Collection, College of Forestry, Northwest Sci-Tech University of Agriculture and Forestry.

Holotype: worker, Mt. Taibai, Taibai County, Shaanxi Province, grassland, on left bank of Xushui River, 1400 m, 24-VI-1997, coll. Wei Cong.