Tylanthidium, gen.n. is proposed to a new species from the north brazilian state of Amazonas - Tylanlhidium tuberigaster, sp.n. - characterized by the absence of arolia and of interalveolar carinas, the peculiar scutellum almost triangular and by the genal preoccipital carinae; the males with the apical border of the mandibles deeple sinuate and the distai tergum densely hairy bellow. Michanthidium nom.n. is given to Gnathanlhidium Urban,. 1992 (non Gnathanthidium Pasteels, 1969).
Hymenoptera; Anthidiinae; Magachilidae; Tylanthidium; taxonomic note