Morphology and internal anatomy of a Culex pipiens L. bipolar gynandromorph that was collected on September 3, 2005 in a gravid trap at Springfield Park in the borough of Queens, New York City, NY is presented. The head of the mosquito possessed male palpi, compared to the rest of the body, which had female anatomical and morphological characteristics. The relation of morphological characteristics to physiological responses of the gynandromorph is discussed.