“…Environmental factors including light, temperature and other climatic conditions influence light, mating and biting activities of these flies (Burnett and Hays, 1974). There are often definite peaks of activity during a 24-hour period for each species (Joyce and Hansens, 1968;Richardson and Wilson, 1969;Catts and Olkowski, 1972;Anderson, 1973;Kangwagye, 1973;Roberts, 1974;Dale and Axtell, 1975b).…”