A gynandromorph of Culiseta morsitans was found in a collection made from resting shelters located near the village of Central Square, Oswego County, New York in June of 2004. This is the 1 st report of a gynandromorph of this species. The polar (anterior posterior) gynandromorph possessed a head and legs with male characteristics, and an abdomen with female characteristics. The specimen is further described and compared to a normal male and female of this species.