Ctenanthidium, gen.n. de Dianthidiini com quatro espécies novas da América do Sul (Hymenoptera, Megachilidae)

Ctenanthidium, gen.n. is proposed to include four new neotropical species of Anthidiinae bees, Ctenanthidium gracile, sp.n. from Brazil (Paraná, Curitiba); Ctenanthidium argentinum, sp.n. from Argentina (Córdoba); Ctenanthidium bifasciatum, sp.n. from Uruguai (Colonia, La Estanzuela) and Ctenanthidium nigripes, sp.n. from Bolívia (Potosi, Casa Grande). The males are characterized by the border of the third sternum with an apical comb of strong bristles apically rounded, between lateral fringes