BRIDGEPORT -- Two Stamford men pleaded guilty Tuesday to federal charges of going on a four-month bank robbery spree, stealing a total of $41,272 from 12 bank branches throughout southern Fairfield County last summer.

Christopher Davis, 34, and Spero Moschos, 29, both admitted to the string of bank heists in U.S. District Court in Bridgeport and now face a maximum prison term of 20 years for each count. Davis pleaded to four counts of bank robbery while Moschos pleaded to five as part of their plea agreements, said Tom Carson, the spokesman for the U.S. attorney for Connecticut.

Davis partnered up with Moschos for eight of the Connecticut robberies. Banks in Norwalk, Westport, Stamford, Darien, Wilton, Fairfield and West Harrison, N.Y. were hit in the spree. One of the Westport banks was robbed twice.

Moschos and Davis used a threatening note and verbal demands to rob the banks, the U.S. Attorney's office said in a statement.

At a TD Banknorth branch in Westport on May 15, 2009, Moschos gave the teller a note saying, "Do not push the alarm. I have a bomb. Empty your drawer and no one will get hurt." He did not steal any money on that occasion.

In July, Davis walked into a Citibank branch in Darien and told one patron, "I see you. Don't move. I'll kill you." Moschos waited outside in a get-away car.

Last week, prosecutors in state Superior Court in Stamford dropped their cases against both men because the federal government indicted them in May.

In a confession, Moschos told police he had gambling and drug problems, court records show.

"Spero unfortunately had some serious personal difficulties that led him down this path," defense attorney Lindy Urso said. "He is extremely remorseful and eager to pay his debt to society so he can resume his life."

Davis and Moschos will be sentenced on Sept. 24. Both have been incarcerated since their arrest by the Stamford Police Department on Aug. 26, 2009.