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 Simopone Forel, 1891 Taxonomy. The genus Simopone is assigned to the tribe Cerapachyini together with Cerapachys and Sphinctomyrmex ( Bolton 2003 ) . Definition of the genus was revised by Bolton and Fisher (2012) . Morphology. Although no Vietnamese specimens of this genus were examined in the present study, according to Radchenko (1993b) and Bolton & Fisher (2012) , workers of a known Vietnamese species of this genus ( S. oculata Radchenko ) may show the following features: Head in full-face view elongate, with sides almost parallel, without a differentiated vertical posterior surface above occipital foramen (instead vertex slopes evently down to upper margin of occipital foramen); preoccipital carina distinct; frontal lobe not vertically raised, in full-face view concealing at least inner margins of antennal sockets; the lobes relatively widely separated from each other by posteromedian portion of clypeus; frontal carina reaching dorsal margin of eye; parafrontal ridge almost reaching anterior margin of eye; mandible subtriangular, armed with minute teeth on masticatory margin; antenna 11-segmented; scape clavate, short; segment II to apical segment short and gradually incrassate; eye large; ocelli present but minute; mesosoma elongate with its dorsolateral borders right-angled; pronotum marginate anteriorly; promesonotal suture represented by transverse trace dorsally but distinct laterally; metanotal groove poorly visible dorsally but distinct laterally; mesotibia without spurs (at most a setiform vestige may remain that cannot be distinguished by light microscopy from other setae at tibial apex); metatibia with a single pectinate spur; metabasitarsus ventrally with a longitudinal glandular groove that occupies at least basal half of tarsomere length; pretarsal claws of all legs with a single preapical tooth on inner margin; propodeum unarmed, but posterior face margined dorsally and laterally with a distinct ridge; petiole in lateral view elongate and compressed dorsoventrally, with a transverse anterior carina. Differentiation. The worker of Simopone is similar to that of Cerapachys , but in the latter the frontal lobes are very narrowly separated from each other by a longitudinal strip of the median portion of clypeus, the antennal socket is in full-face view almost completely exposed, and one or two tibial spurs are present on middle legs. Vietnamese species ( 1 sp. ). Simopone oculata Radchenko, 1993 . Type locality: Kondor Island [Con Son I., Ba Ria-Vung Tau Prov.]. Bionomics. Radchenko (1993b) mentioned that the holotype (worker) of S. oculata was collected under a stump in a secondary tropical forest, but the life history of the species is unknown.