Generic Synopsis of the Formicidae of Vietnam (Insecta: Hymenoptera), Part II — Cerapachyinae, Aenictinae, Dorylinae, Leptanillinae, Amblyoponinae, Ponerinae, Ectatomminae and Proceratiinae Author Eguchi, Katsuyuki Author Viet, Bui Tuan Author Yamane, Seiki text Zootaxa 2014 3860 1 1 46 journal article 10.11646/zootaxa.3860.1.1 ceb30f74-c770-4952-859a-9d3a84a5e087 1175-5326 287059 FDFD1014-8DDA-4EED-A385-95FA4F964CFC Harpegnathos Jerdon, 1851 Taxonomy. The genus Harpegnathos is assigned to the tribe Ponerini ( Bolton 2003 ) . Morphology. Workers of Vietnamese species have the following features (see also Schmidt & Shattuck 2014 ): Worker monomorphic; head in full-face view subrectangular; preoccipital carina present dorsally and laterally; frontal lobe horizontal, almost completely concealing antennal socket; antennal scrobe absent; anteromedian margin of clypeus almost straight; posteromedian part of clypeus relatively narrowly inserted between frontal lobes; labrum with a median process that is visible in full-face view; mandible with an elongate and linear blade which has two rows of many small teeth; ventral part of base of each mandibular blade forming a large extensional triangular flange; antenna 12-segmented, filiform; eye extremely large, located on anteriormost part of side of head; small median and lateral ocelli present; mesosoma in lateral view with an almost gently arched dorsal outline; promesonotal suture completely separating pronotum from mesonotum; mesopleuron not separated from mesonotum by a suture, and feebly separated from metapleuron by a faint suture; metanotal groove absent; propodeum unarmed; orifice of propodeal spiracle elliptical or slit-like; propodeal lobe inconspicuous; inner curvature of pretarsal claws equipped with a tooth in addition to the pointed apex; apicoventral part of foretibia with a small simple spur behind a large pectinate spur; apicoventral part of mid tibia with a simple spur in front of a barbulate spur; apicoventral part of hind tibia with a simple spur in front of a large pectinate spur; petiole without a distinct anterior peduncle, with a triangular subpetiolar process anteroventrally; petiolar node in lateral view much longer than high; girdling constriction between abdominal segments III and IV distinct; abdominal sternite III with a distinct anteroventral flange beneath helcium; sting well developed. Differentiation. The worker of this genus is easily distinguished from that of the other ponerine genera by its extraordinarily modified mandible and extremely developed eye. Vietnamese species ( 1 sp. ). H . venator ( F. Smith, 1858 ) . Au (Ba Be, My Yen, Pu Mat, Hon Ba), Zry (Cat Tien). Bionomics. Harpegnathos venator is rare in Vietnam . It probably occurs in forest edges and relatively sparse forests. We found an undergound nest along a dirt trail in a sparse forest.