Xenos Rossi 1793: 49

Schistosiphon Pierce 1908: 80 [ Xenos peckii Kirby 1813]. Acroschismus Pierce 1908: 79 [ A. hubbardi Pierce 1908]. Vespaexenos Pierce 1909: 133 [ V. crabronis Pierce 1909]. Belonogastrechthrus Pierce: 1911: 498 [ B. zavattarii 1911]. Clypoxenos Brèthes 1923: 46 [ C. americanus Brèthes 1923]. Brasixenos Kogan & Oliveira 1966: 346 [ B. fluminesis Kogan & Oliveira]. Genotype: Xenos vesparum Rossius