ardua Mitchell, new comb, new status.

Megachile ardua Mitchell 1930: 268 . Male. Type locality: Chapada [dos Guimarães], Brazil. Type repository: ANSP 4124. Examined.

Megachile ardua var. tacanensis Moure 1948: 322 . Male. Type locality: Tacanas, Tucuman, Argentina. Type repository: UFPR.

Megachile (“ Ptilosaroides ”) ardua Schlindwein 1995 . “ Ptilosaroides ” Schlindwein seems to be a nomem nudum.