Police say at about 12:35 p.m. Wednesday, a man walked into the Wells Fargo Bank in the 1400 block of on DuPont Highway.
He presented a note to a 32-year-old teller demanding money.
The teller gave the robber cash and he fled on foot.
Police describe the suspect as a Black male, 25 - 35 years old, 5'11" to 6'2", 190 to 225 pounds, wearing dark green overalls and a dark baseball cap with a red brim.
Anyone with information about the robbery or the suspect is asked to contact the Delaware State Police Robbery Unit at Troop 2 at 302-834-2630 extension 6, or Delaware Crime Stoppers at 1-800-TIP-3333.
Information may also be provided via the internet at www.tipsubmit.com or anonymously by text message to 274637 (CRIMES) using the keyword "DSP."