"Some species have their taxonomy clarified, with Perdita citrinella Graenicher, 1910 syn. nov. recognized as a junior synonym of Perdita perpallida Cockerell, 1901, P. bequaerti syn. nov. recognized as a junior synonym of P. pallidipennis Graenicher, 1910 stat. nov.,"

A checklist of the bees (Hymenoptera: Apoidea) of Minnesota
https://www.mapress.com/zt/article/view/zootaxa.5304.1.1