Considered extirpated in Maryland until one population was found along the Potomac River in Montgomery County in September of 2015 (Knapp, pers. comm.).
There are 10 records in the project database.
GA | AL | WA | FR | CL | MO | HO | BA | BC | HA | CE | PG | AA | CV | CH | SM | KE | QA | CN | TA | DO | WI | SO | WO |