Further description of Ananthidium Urban, with keys to the Argentine Anthidiini (Hymenoptera: Megachilidae)

Additional descriptive information is given for the genus Ananthidium Urban with a key to species Also, new geographical and floral records are given. A key to the genera of the Anthidiini of Argentina is provided. Bothranthidium Moure is considered a subgenus of Anthodioctes. A brief discussion of generic characters of the South American genera are given. Carlotica Moure & Urban is placed as a synonym of Epanthidium Moure. Also, Saranthidium Moore & Hurd is considered as a subgenus of Hypanthidiodes Moore.