Odontomachus linearis Chen et Zhou, 2018

Chen, Z. - L., Shi, F. - M. & Zhou, S. - Y., 2018, A new species of Odontomachus Latreille, 1804 (Hymenoptera: Formicidae) from China, Far Eastern Entomologist 356, pp. 1-8 : 3-6

Odontomachus linearis Chen et Zhou , sp. n.

Figs 1–4

TYPE MATERIAL. Holotype – worker, China: Hunan, Ningyuan, Jiuningshan ,

2004.IX.27, coll. Jianhua Huang, No. G 041027. [ The type specimen is deposited in the Insect Collection , Guangxi Normal University, Guilin, China ( GXNU).

DESCRIPTION. Holotype worker. TL 8.10, HL 2.19, HW 1.59, CI 73, SL 1.79,

SI 112, ML 1.13, ED 0.20, PW 0.91, MSL 2.46, PL 0.25, PH 0.89, DPW 0.36, LPI

356, DPI 142.

In full-face view head uniquely shaped ( Fig. 1 ), longer than broad (CI 73); posterior margin slightly concave, occipital carina V-shaped; median furrow as dark line on vertex; poster corner round, lateral margin distinctly concave, as wide groove extend to the middle of the poster part of the head. Mandible elongate and linear,

masticatory margin consisting three large and truncate teeth, inner margin with four small and un-conspicuous denticles. Clypeus divided into three lobes, anterior margin of each lobe convex; frontal carinae short, not exceed the frontal lobe. Scape long,

almost reaching posterior corner of head. Eye in middle size, situated at the anterior third of lateral margins of head.

In lateral view pronotum weakly convex; promesonotal suture markedly impres-

sed; dorsum of mesonotum straight, slow down backwardly; Propodeum elongated,

dorsum almost straight and gradually sloping posteriad, propodeal declivity weakly convex, posterodorsal corner blunt. Petiole widest at base, node distinctly and immediately narrowed dorsally, tapering apically to a short spine directed slightly rearward. subpetiolar process rounded triangular, ventral apex blunt. Sting extruding.

In dorsal view mesosoma slender; pronotum broadest, edges rounded; promesonotal suture obvious and metanotal groove absent.

Mandibles smooth and shining; in full face view frontal lobe with striae, diverging toward outside, the rest of head smooth and shining; in dorsal view the anterior neck full-face view; 2 – mandible in anterodorsal view; 3 – body in dorsal view; 4 – body in lateral view.

view; 6 – mandible in anterodorsal view; 7 – body in dorsal view; 8 – body in lateral view.

of pronotum with weakly striaed, the rest part smooth and shining; mesonotum and propodeum with longitudinal and coarse ridges; posteroventral part of mesopleuron weakly striated; metapleuron weak striae. Petiole and gaster smooth and shiny. Apical tooth and ventral face of Mandibles with long setaes; poster part of gaster with a few short setaes; whole body with sparse pubescence. Head, mesosoma, petiole,

and gaster reddish brown, legs yellowish brown.

ETYMOLOGY The species is named after its dorsum of propodeum with longitudinal ridges.

NOTES. This new species is similar to Odontomachus fulgidus Wang, 1993

( Figs 5–8 ), but can be easily distinguished from the later by its longitudinal ridges of the dorsal propodeum, strongly contrasts to the transverse ridges of O. fulgidus.

In addition to the difference above, the three apical tooth of mandible distinctly shorter and blunter than the later one.

KEY TO THE SPECIES OF ODONTOMACHUS FROM CHINA BASED ON

Figures

Figs. 1– 4. Odontomachus linearis Chen et Zhou, sp. n., holotype worker. 1 – head in

Figs. 5–8. Odontomachus fulgidus Wang, 1993, holotype worker. 5 – head in full-face