The relationships between wingbeat frequency and wing loading indicated again that large insects compensate for high wingloading by increasing wing beat frequency. ,Slopes for regression equations for the relationships between wing loading and wingbeat frequencies were significantly different for insects weighing < 0.03 g than for all larger groups of insects. We are concerned here with those relating to the wingbeat frequency/wing loading/ weight relationships of small (<0.03 g) versus larger insects. Examinations of still finer details of the effects of temperature and gender on wingbeat frequencies are confined to members of Homoptera. Comparisons are also made to larger vertebrates (bats and birds).