An accused Long Island bank robber who was let loose under the state’s new bail reforms — only to cut off his court-ordered ankle monitor and go on the lam — has been arrested for two new bank heists.

Romell Nellis, 40, who was already accused of robbing two banks over the past three months, was collared Wednesday for allegedly knocking over a Roslyn Savings Bank on Saturday and a Wells Fargo Bank on Tuesday, Nassau County police said.

He made off with undisclosed amounts of cash, officials said.

Police initially arrested Nellis on Jan. 8, and he was charged with making off with about $9,500 after bank robberies in West Hempstead on Dec. 17 and Valley Stream on Dec. 30.

In each case, the homeless ex-con allegedly handed tellers a note that said, “I have a gun!” and demanded money in “$100s, 50s & 20s.”

At the time of that arrest, Nellis was also awaiting sentencing in Central Islip federal court for violating his supervised release from a 2012 crack-trafficking case, authorities said.

When he went before Nassau County District Judge David McAndrews on Jan. 9, the fed-up jurist put his foot down, flouting the state’s new bail-reform law and ordering Nellis held in lieu of $10,000 cash or $20,000 bond.

The controversial new laws prohibit judges from setting bail on most misdemeanors and non-violent felonies — including some bank jobs.

“I don’t want you walking around my neighborhood,” McAndrews told Nellis, calling the accused bank robber “a menace to society.”

But it didn’t take long for Nellis to walk free. His lawyer appealed the bail ruling, which then went before Nassau County Judge Christopher Quinn.

Quinn ordered Nellis released under the new bail laws — although he did require that he wear the ankle bracelet to monitor his movements. Once free, police said Nellis cut off the device and disappeared.

He resurfaced Saturday, when he allegedly walked into the Roslyn Savings Bank in West Hempstead, handed the teller a note stating he had a gun and then fled southbound with an undisclosed amount of loot.

There were six employees inside the bank but none were injured, according to Nassau County police.

On Tuesday, he allegedly robbed a Wells Fargo branch in Hempstead around 5 p.m., authorities said.

He was arrested Wednesday and charged with two counts of third-degree robbery and two counts of third-degree grand larceny.

Nellis was also charged on an open warrant for violation of probation for cutting off his electronic monitoring device, police said in a statement.

Officials at the Nassau County District Attorney’s Office and the county’s court system declined to comment on the case.

Nellis is expected to be arraigned on the new charges Thursday.

He is still awaiting sentencing on the 2012 drug case, which was scheduled for last month but was put off until March because Nellis’ lawyer said he was scheduled to enter a drug-treatment program.