Construction of a suction trap for hourly collection of coastal biting flies is described. The trap uses a turntable collector, weighs about 35Ib, operates on a-c current, and is relatively simple and economical to build. Over 1,000 hr of operation in the field have proven the trap to be very reliable. With this trap 10 species of biting flies were captured near a Spartina alterniflora Loiseleur dominated salt marsh in Carteret County, North Carolina. Coastal biting gnats (Diptera: Ceratopogonidae) comprised the greatest percentage of the catch.