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Intraseasonal changes in the melanic frequency of Adalia have been recorded in and around Berlin and Birmingham; in the latter place a steady decrease in frequency has also occurred over several years. E sti mates of the intensity of natural selection have been made from the observed changes in frequency. Selection against black individuals in winter, and against red ones in summer, appears to be higher in Berlin (52 % against black heterozygotes in winter and 33 % against red homo zygotes indoi:10.1098/rspb.1975.0083 fatcat:yeyauktvvbakvjikdixizruek4