An Arlington policeman pursued a motorist into Washington yesterday following a robbery and shot him after the man crashed into another car and fled from his vehicle, D.C. police reported.

The man was identified as Preston Hayes Rosser, 24, of 819 Alabama Ave. SE. He was reported being treated last night for a wound in the left arm in the lockup ward at D.C. General Hospital.

D.C. police said he was charged with being a fugitive from Arlington. Arlington police said they obtained warrants charging Rosser with robbery and use of a firearm in a robbery in connection with the holdup of an Arlington jewelry store.

According to Arlington County police, a man armed with a handgun entered D&A Jewelers at 4801 Columbia Pike shortly before 3 p.m.

The man took two gold watches and fled in a 1977 automobile, Arlington police said.

After the robbery, a witness called police to give a description of the gunman and the getaway vehicle, and a lookout was broadcast, D.C. police said.

Officer Andrew Sekellick of the arlington police spotted a car that appeared to fit the description of the getaway vehicle, and he began a chase which reached high speeds across the 14th Street bridge and onto Southwest Freeway, Arlington police said.

Near the 8th Street exit, Sekellick tried to cut off the car, D.C. police said. The car began to skid and struck the police car.

Finally, police said, the pursued car turned to face oncoming traffic and collided with another automobile. There were no injuries in the crash, D.C. police said.

When the driver of the pursuided car emerged and attempted to flee, Sekellick shot him, according to D.C. police.

Rosser was flown by U.S. Park Police helicopter to the Washington Hospital Center, where he was treated before being transferred to D.C. General, D.C. police said.