The victims in both cases have positively identified Boccaleoni as their attacker in photo line-ups, sheriff?s Lt. Chris Spallino said.
But detectives are continuing to investigate his potential involvement in a series of other episodes on rural roadways in which women traveling alone reported being followed aggressively by a male driver who sometimes flashed his headlights, pulled alongside or feigned emergencies to try to get them to pull over.
One young woman was groped when she pulled over on Bennett Valley Road while driving home from Santa Rosa Junior College late one night last November, authorities said.
In another case in the Calistoga/Porter Creek road area, a man tried to force down the window of a woman?s car, they said.
In the most recent case, a woman on Sexton Road outside Sebastopol said her assailant persuaded her to pull over by saying her car was leaking fluid, tried to yank her out of the car, then grabbed her by the neck and threatened her if she resisted.
She managed to shove him off of her before throwing her car into gear and speeding away with the door open, authorities said.
Boccaleoni is still on probation for a San Francisco case in which four women were groped by a stranger during a single two-hour period in December 2005.
Police said Boccaleoni drove around the Marina District looking for women to approach for directions, then groped them when he did.
One of the women got Boccaleoni?s license plate number, leading to his arrest.
All four women identified him in a photo line-up, police said.