Bedbugs may be onboard.

The MTA have yanked a half-dozen city buses off the road because they may be infested with the blood-sucking insects, officials said Tuesday.

The suspect vehicles were quarantined on the outskirts of the Kingsbridge Bus Depot in Manhattan after a rider reported seeing what appeared to be the parasitic bugs crawling on the seats, New York City Transit chief Andy Byford told The Post.

“A customer reported budbugs. We’ve quarantined six buses while we check it out,” he said. “It’s a difficult environment for bedbugs to endure. The important thing is to be responsive.”

He added, “It could happen anywhere. Could happen in the cinema, could happen in the theater. … Fumigation tackles the issue after the event.”

The MTA is, “not certain that they are bedbugs yet,” Byford added.

Union shop steward Michael Enriquez called the situation a possible epidemic.

“Usually, we would never see buses knocked out for bedbugs. It seems to be an epidemic that’s spreading,” Enriquez told WABC.

Enriquez added: “At one point in time our buses were regularly fumigated and there would be a sticker placed on the bus with a note that it was fumigated…This practice seems to have ceased for whatever reasons.”

It was not immediately clear which bus lines were affected.