She pulled a rope-a-groper.

The victim of a subway pervert turned the tables on her attacker when she found the creep’s MetroCard and gave it to officials — who used the info to find a surveillance photo of him on a bus.

Cops said on Monday the 24-year-old woman was on a northbound 4 train around 11:45 a.m. on Feb. 13 when the perv slid his hand over to her leg several times as the train traveled north through the Mt. Eden/176th Street subway station.

“She was reading her book,” the source said. “She felt his hand on the side of her thigh and butt.”

But when the man then exited the train at Burnside Avenue, he dropped his MetroCard while fleeing, a police source said.

The victim picked up the card and walked into the NYPD’s Transit District 11 to report the crime.

Having the card allowed officials to track where the perv had been, including on a nearby BX13, where a security camera got photos of the suspect.

“We were able to track his usage,” the source said. “So we went and got some footage.”

The victim later identified him when was shown photos taken on the bus, sources said.

Police released the photos of the suspect the same day The Post ran an exclusive story about NYPD cops hunting deviants who return to the city’s subways over and over to commit perverted acts.

The Post’s story described a list of transit deviants who are driving sex crimes with their refusal to stay away even after they are arrested repeatedly. They commit the same crimes over and over and are sought by undercover NYPD officers who carry their photos and attempt to bust them in the act, polices sources told The Post.

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