Pseudoanthidium

Pseudoanthidium is a group of small to medium-sized, compact megachilids. Their coloration pattern resembles that of Anthidium and Anthidiellum bees (i.e., black cuticle with bold yellow markings). However, the abdominal markings of Pseudoanthidium are interrupted or reduced to small lateral spots, giving them an overall darker appearance. Like other megachilids, the females have a whitish ventral scopa and typically collect plant fibers to build the partition of their brood cells. Males are similar in appearance to females but with almost completely light-colored faces and different eye color. Unlike similar species, the tip of the abdomen of the males is rounded, without spines. They are specialized foragers that have thistles as hosts.