A taxi driver was robbed by a passenger.
He had collected five men in Manor Road, Chigwell, and dropped three off in Pools Lane, Chelmsford.
He drove the remaining two to Coral Close in South Woodham Ferrers, where there was a dispute about the fare.
The driver agreed to take one of the men to a cashpoint so they could withdraw some money.
But as he drove along the A132 Burnham Road, the one remaining man grabbed him from behind forcing him to stop.
He got out and opened the driver’s door, bit the victim on the hand, took his takings for the evening then ran off.
PC Andy Tindale, of Chelmsford CID, said: "The driver needed hospital treatment for the wounds to his hand and was left in considerable pain.
“This was an extremely distressing incident for him and I want to arrest this man as soon as possible.”
Essex Police have released an e-fit of the suspect.
He was about 5ft 11in tall and wore black jeans, a black top and black shoes.
The robbery was at 6.45am on Sunday, March 9.
Anyone with information should call Chelmsford Police Station on 101 or ring Crimestoppers anonymously on 0800 555 111.