Megalopinus lingafelteri spec. nov. from Arizona, U.S.A (Coleoptera: Staphylinidae: Megalopsidiinae)

A new species of the genus Megalopinus Eichelbaum, 1915 from the Huachuca Mountains in Arizona, U.S.A., Megalopinus lingafelteri spec. nov., is described and illustrated. It is the northernmost member of the Megalopinus peploides (Sharp, 1886) species group. Its habitat is illustrated, comparing it to presumptive closely related species.