The vision of Culex quinquefasciatus was studied in the laboratory. The attractiveness of colors (black, white, brown, yellow, blue, a skin tone) was evaluated with respect to the collection of Cx. quinquefasciatus in natural light, in the dark, and in ultraviolet light. Culex quinquefasciatus prefers both black and brown in natural light and ultraviolet light, but, as expected, there is no preference in the dark. There were no significant differences among the other 4 colors in natural light and ultraviolet light.