Genus Delta de Saussure, 1855

Delta de Saussure, 1855: 130, 132, 143, name for divisions II and III of genus Eumenes Latreille in de Saussure, 1852: 44, 60. Type species: Vespa maxillosa De Geer, 1773 [= Vespa emarginata Linnaeus, 1758], by subsequent designation of Bequaert 1925: 137 [erroneously as Sphex maxillosus De Geer, correctly in 1926: 487].

Erinys Zirngiebl, 1953: 173, as subgenus of Eumenes Latreille. Junior homonym of Erinys Rye. Type species: Ves pa unguiculata Villers, by monotypy.

Alfieria Giordani Soika, 1934: 436 . Type species: Eumenes anomalus Zavattari, by original designation and monotypy.

The genus Delta includes almost 50 species and many subspecies, distributed throughout the Old World (van der Vecht & Fischer 1972, Cardale 1985, Carpenter et al. 2010, Nugroho et al. 2012).