Video shows the suspect sitting in the back of a cab earlier this month.
You can see him pull out a knife and threaten the driver before grabbing cash and taking off.
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Police say the suspect is behind seven other similar robberies.
In two of them he also had a gun.
Investigators are looking for him.
Call the NYPD's Crime Stoppers Hotline at 1-800-577-TIPS (8477) or for Spanish, 1-888-57-PISTA (74782). You can also submit tips by visiting the CrimeStoppers website at crimestoppers.nypdonline.org or by messaging on Twitter @NYPDTips.
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