Hiram Adams, 45, of the Mt. Airy section of Philadelphia, entered the plea Wednesday on four counts of bank robbery and one count of attempted bank robbery.
Adams faces a total maximum sentence of 100 years in prison and a fine of up to $1.25 million, the U.S. Attorney said.
Sentencing is scheduled for February 17th.
He was arrested in August after a year-long robbery spree. A bank teller had spotted him the previous day in Havertown, and police were there when he returned to scope out the bank.
Action News has learned that he was previously arrested in Philadelphia back on July 10th for drugs, but he was subsequently let go because, at the time, no one knew he was the alleged "Mummy Bandit."
At the time of the arrest, Adams was with his girlfriend, who was also arrested, and her three young children. The children, ages 6, 4, and 2, were handed over to the girlfriend's parents.
Adams was charged with the following robberies:
1/21/09:Valley Green Bank, 7226 Germantown Avenue, Philadelphia
7/8/09: Wachovia Bank, 1700 Market Street, Philadelphia
5/4/10: Citizens Bank, 3201 Cheltenham Avenue, Wyncote
6/4/10: Sovereign Bank, 800 East Willow Grove Avenue, Wyndmoor