Taxonomic revision of the Afrotropical species of Pachyanthidium Friese (Hymenoptera: Megachilidae: Anthidiini)

The Afrotropical species of Pachyanthidium Friese are revised. Sixteen species are recognized in four subgenera. One new species, Pachyanthidium ( Trichanthidium ) anoplos sp. n. is described; and one species, Pachyanthidium ( Trichanthidium ) cucullatum (Friese), is reinstated as a valid species. Four new synonymy are proposed: Pachyanthidium minutulum Pasteels = Pachyanthidium ( Trichanthidiodes ) semiluteum Pasteels syn. n.; Anthidium africanum Smith = P. ( P. ) bicolor (Lepeletier) syn. n.; Pachyanthidium cordatum swellemdamense Mavromoustakis = Pachyanthidium ( P. ) cordatum (Smith) syn. n. and Anthidium cordatum var. salamense Friese 1931 = Pachyanthidium ( P. ) salamense (Friese 1915) syn. n. Identification keys for the Afrotropical species are given.