Some ecological observations on houseflies in Egypt.

Observations were made over a three-year period (1949-51) on the occurrence of peaks and depressions in the housefly population of Talbia, a small village in a rural district near Cairo. The results, illustrated by eight figures, are based on counts of flies collected on wooden grids placed at selected sites.Two peaks and two depressions occur annually-in spring and autumn, and at midsummer and in winter, respectively.