Found on rotting log on ground in floodplain deciduous forest,
These beetles were formerly placed in the Handsome Fungus Beetle family, Endomychidae. They have now been split into their own family, Anamorphidae.
Thanks to V. Belov at BugGuide.net for the ID: https://bugguide.net/node/view/2276394#3647894
First photo record for MBP and second record overall. First record on BugGuide.net for Maryland.
(Orthotaenia fasciatana) Rocky Gap State Park, Allegany County, Maryland. June 26, 2015.