The leader of a white supremacist gang in Arkansas who escaped from a county jail earlier this week was captured on Thursday, but a second inmate remains a fugitive, the authorities said.

The captured inmate, Wesley Gullett, was spotted by the chief marshal of Dover, Ark., David Dalrymple, during a routine patrol around 11:30 a.m., according to Lt. Todd Steffy of the Dover Marshal’s Office .

Mr. Gullett was taken into custody without incident, Lieutenant Steffy said in an interview Thursday. The other escapee, Christopher Sanderson, a felon who is facing a firearms possession charge in an unrelated case, remains a fugitive.

“We were aware of the escapees,” the lieutenant said. “We had photographs of them.”

There had been a $10,000 reward for information leading to the capture of Mr. Gullett, 30, whom prosecutors identified as the president of the New Aryan Empire, and who was ensnared earlier this year in a roundup of 54 members of the hate group. Mr. Gullett is facing charges of attempted murder, illegal drug distribution and racketeering.