Photopositive responses of Musca domestica and Lucilia sp. to monochromatic lights.

The specimens Diptera: Musca dornestica and Ludlia sp. adapted to dark were offered two monochromatic lights of different wavelengths. Musca dornestica always preferred the light of a shorter wave out of two monochromatic equiquantum lights. Six color regions presumably qualitatively different were distinguished for this fly: violet-blue, blue, green, yellow-green, orange and red. Lucilia sp. exhibited no preference to certain ranges lying on both sides of the region maximally saturated. Nevertheless this fly well distinguished three colors ranges: violet-blue, green-yellow and orange-red.