Fototassia negativa e orientamento astronomico solare in due specie di Stafilinidi ripari (Paederus rubrothoracicus Goeze e Stenus bipunctatus Erichson)

Sun orientation was analysed for the first time in Coleoptera Staphilinidae from river banks under natural conditions and their responses to artificial lights in the laboratory throughout the night-day cyle. Both species were phototactic negative, showing a tendency to compensate the movement of sun azymuth throughout the day. At night they confirmed the Talitrus model of sun azymuth movement's compensation.