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Taxonomy. The genus DilobocondylaHNS is assigned to the tribe FormicoxeniniHNS (Bolton 1994, 2003). A key to the described species was given by Wheeler (1924). Workers of Vietnamese species have the following features.
Worker monomorphic; head in full-face view subrectangular; preoccipital carina distinct laterally; posterolateral corner of head with a small acute angle or denticle exterior to preoccipital carina; frontal carina distinct; antennal scrobe shallow but distinct; median portion of clypeus broadly inserted between frontal lobes; anterior clypeal margin weakly convex and with a weak emargination at midpoint; median clypeal seta, if present, indistinct; mandible triangular, with 6 teeth on masticatory margin; antenna 12-segmented, with conspicuous 3-segmented club; eye relatively large; promesonotum in lateral view hardly or weakly raised; promesonotal suture absent dorsally; metanotal groove weakly impressed dorsally; propodeum in lateral view weakly swollen posterodorsad, unarmed; propodeal lobe well developed; femora strongly and abruptly incrassate in distal two thirds; petiole elongate, cylindrical, slightly arcuate in lateral view; subpetiolar process distinct, tooth-like, located anteroventrally near articulation with mesosoma; postpetiole in lateral view with acute anteroventral angle; gaster short, oval in dorsal view.
The worker of DilobocondylaHNS is easily distinguished from that of other myrmicine genera known from Vietnam by posterolateral corner of head with a small acute angle or denticle exterior to preoccipital carina, propodeum unarmed, femora strongly and abruptly incrassate, and petiole elongate and sylindrical.
Vietnamese species. One species has been described from Vietnam: fouqueti SantschiHNS (type locality: Ha Noi). Two additional species have been recognized by us from Vietnam: sp. eg-1 (Da Lat); sp. eg-2 (Tay Ye n Tu).