Four Westchester County police departments say they have arrested 66 people in a months-long probe into high-priced prostitution rings that advertised on a popular Web site.

The Elmsford, Greenburgh, Rye and Rye Brook police departments say the nine-month investigation also netted more than $21,000 in apparent prostitution proceeds. Some defendants were charged with prostitution, others with patronizing prostitutes or other offenses.

Rye Brook Police Chief Gregg Austin says undercover officers set up dates after spotting ads for sexual services on the online clearinghouse Craigslist.

A Craigslist spokeswoman did not immediately respond to an e-mail early Saturday. She has said in the past that the site bans all illegal activity and cooperates with law enforcement.