The FBI announced yesterday the arrest of a 27-year-old Washington man who, along with a second suspect, has been charged with a series of bank robberies in Maryland between Jan. 31 and Feb. 10.

Agents from the FBI's Washington field office said they arrested Leroy Robinson at his home at 15 Seaton Pl. NE early yesterday, according to an FBI spokesman.

The second man, James Earl Mills, 26, of 5620 Livingston Ter., Oxon Hill was arrested by the FBi on Feb. 22, following a holdup at the United Virginia National Bank branch in Great Falls, Va., the spokesman said.

According to the spokesman, a federal grand jury in Baltimore has charged both men in connection with bank robberies in Silver Spring, Potomac and Burtonsville, Md.

Mills also has been indicted, by the same grand jury, for bank robbery in the holdup in Virginia and another robbery at a bank in Camp Springs, Md. the FBI said.

The spokesman said a shotgun was used in most of the holdups and thatthe two bandits wore ski masks. A shotgun, similar to the weapon seen in photographs taken during the robberies at the banks, was recovered at Mills' home when he was arrested, the FBI said.

Robinson was being held at the Prince George's County detention center on $100,000 bond. Mills is being held at the Baltimore City jail, also on a $100,000 bond, according to the FBI.

Mills was arrested the day of the Northern Virginia robbery after an eyewitness recalled that a white car at the scene - which had been placed at other bank robberies - had a beer can wedged into a rear bumper in a manner that covered a letter on the car's license plate, the FBI said, Agents had stopped Mills, who was driving a similar white car, shortly after the robbery but released hom after questioning, the spokesman said.

Later, after the agents talked to the witness and recalled that they too had noticed the beer can, Mills was arrested. Agents from the FBI's Alexandria and Baltimore field offices, as well as members of the Montgomery County Police Department, participated in the investigation that led to the arrests of the two men.