Abstract
The authors report the genus Zethus Fabricius from Taiwan for the first time and describe a new species, Zethus taiwanus sp. nov. (holotype, Guishan, Xindian District, New Taipei City), which is most similar to Z. nigerrimus Gusenleitner, 2001 in female morphology. Zethus trimaculatus Cameron, 1904 is re-described based on the female holotype and the male of Z. nigerrimus also described for the first time. Following Giordani Soika's criteria for sub-groupings of the Oriental Zethus, Z. taiwanus, Z. nigerrimus and two recently described species, Z. tansoneus Nguyen & Carpenter, 2016 and Z. tumidus Nguyen & Carpenter, 2016, are subsequently added to the trimaculatus-group. A key to the Zethus trimaculatus-group is provided based mainly on male characters.
References
Bitsch, par J. (2012) Morphologie comparée des derniers segments du gastre et des genitalia mâles des Vespidae. 1. Sous-famille des Eumeninae (Hymenoptera). Bulletin de la Société entomologique de France, 117 (2), 199–218.
Bohart, R.M. & Stange, L.A. (1965) A revision of the genus Zethus Fabricius in the Western Hemisphere (Hymenoptera: Eumenidae). University of California Publications in Entomology, 40, 1–208.
Cooper, M. (2016) A new species and new records of Zethus Fabricius in the pallidus-group (Hymenoptera: Vespidae, Eumeninae). Entomologist’s Monthly Magazine, 152, 207–210.
Cameron, P. (1904) Descriptions of new genera and species of Hymenoptera from India. Zeitschrift für systematische Hymenopterologie und Dipterologie, 4, 5–15.
Giordani Soika, A. (1941) Studi sui Vespidi Solitari VI., Studio di alcuni tipi di vespidi solitari. Bollettino della Societa Veneziana di Storia Naturale e del Museo Civico di Storia Naturale, 2, 212–217.
Giordani Soika A. (1958) Notule vespidologiche VIII., Contributo alla conoscenza degli Zethus orientali. Bollettino del Museo Civico di Storia Naturale di Venezia, 11, 75–80.
Giordani Soika, A. (1979) Revisione delle specie etiopiche e malgasce della sottofamiglia Discoeliinae (Hym.). Bolletino del Museo Civico di Storia Naturale di Venezia, 30, 19–65.
Giordani Soika, A. (1995) Nuovi Eumenidi della Regione Orientale e della Papuasia. Bollettino del Museo civico di storia naturale di Venezia, 44, 91–99.
Gusenleitner, J. (1988) Über Eumenidae aus Thailand, mit einer Bestimmungstabelle für orientalische Labus-Arten (Hymenoptera, Vespoidea). Linzer Biologische Beiträge, 20 (1), 173–198.
Gusenleitner, J. (2001) Beitrag zur Kenntnis von Faltenwespen der orientalischen Region (Hymenoptera, Vespidae, Eumenidae). Linzer Biologische Beiträge, 33 (2), 655–662.
Gusenleitner, J. (2007) Bemerkenswerte Faltenwespen-Funde aus der orientalischen Region Teil 3 (Hymenoptera: Vespidae, Polistinae, Eumeninae). Linzer Biologische Beiträge, 39 (1), 97–104.
Gusenleitner, J. (2010) Bemerkenswerte Faltenwespen-Funde aus der orientalischen Region Teil 5 (Hymenoptera: Vespidae, Eumeninae). Linzer Biologische Beiträge, 42 (1), 695–709.
Gusenleitner, J. (2011) Eine Aufsammlung von Faltenwespen aus Laos im Biologiezentrum Linz (Hymenoptera: Vespidae: Vespinae, Stenogastrinae, Polistinae, Eumeninae). Linzer Biologische Beiträge, 43 (2), 1351–1368.
Gusenleitner, J. (2012) Bemerkenswerte Faltenwespen-Funde aus der orientalischen Region Teil 6 (Hymenoptera: Vespidae, Eumeninae). Linzer Biologische Beiträge, 44 (2), 1045–1052.
Gusenleitner, J. & Gusenleitner, F. (2013) Eine neue Gattung und zwei neue Faltenwespen aus der Orientalischen Region (Hymenoptera, Vespidae, Eumeninae). Linzer Biologische Beiträge, 45 (1), 133–139.
Harris, R.A. (1979) A glossary of surface sculpturing. Occasional Papers of the Bureau of Entomology of the California Department of Agriculture, 28, 1–31.
https://doi.org/10.5281/zenodo.26215Hermes, M.G., Meloa, G.A.R. & Carpenter, J.M. (2014) The higher-level phylogenetic relationships of the Eumeninae (Insecta, Hymenoptera, Vespidae), with emphasis on Eumenes sensu lato. Cladistics, 30, 453–484.
https://doi.org/10.1111/cla.12059Lopes, R.B., Kumagai, A.F., Stange, L.A. & Hermes, M.G. (2015) Cladistic analysis and systematic revision of the Zethus smithii (de Saussure) species-group sensu Bohart & Stange (Hymenoptera: Vespidae : Eumeninae). Invertebrate Systematics, 29, 421–443.
https://doi.org/10.1071/IS15005Lopes, R.B., Noll, F.B. & Stange, L.A. (2017) Zethus (Zethus) wileyi (Hymenoptera, Vespidae, Eumeninae), a new species with its own species-group. Zootaxa, 4231 (1), 137–144.
https://doi.org/10.11646/zootaxa.4231.1.11Nguyen, L.T.P. & Carpenter, J.M. (2016) Taxonomic review of the genus Zethus Fabricius (Hymenoptera: Vespidae: Eumeninae) from Vietnam with descriptions of four new species. Entomological Science, 20 (1), 24–32.
https://doi.org/10.1111/ens.12218Nguyen, L.T.P., Dang, H.T., Kojima, J.I. & Carpenter, J.M. (2014) An annotated distributional checklist of solitary wasps of the subfamily Eumeninae (Hymenoptera: Vespidae) of Vietnam. Entomologica Americana, 120 (1), 7–17.
https://doi.org/10.1664/13-RA-010.1Nguyen, L.T.P. & Xu, Z. (2017) First record of the genus Zethus Fabricius, 1804 (Hymenoptera: Vespidae, Eumeninae) from China with description of a new species. Zootaxa, 4272 (4), 596–600.
https://doi.org/10.11646/zootaxa.4272.4.10Selis, M. (2017) Revision of the Zethus luzonensis species-group (Hymenoptera: Vespidae: Eumeninae), with description of a new species. Zootaxa, 4232 (3), 444–450.
https://doi.org/10.11646/zootaxa.4232.3.13Yamane, Sk. (1990) A revision of the Japanese Eumenidae (Hymenoptera, Vespoidea). Insecta Matsumurana, New Series, 43, 1–189.