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本文报道了我国北方15种蚤的季节数量消长情况。这些蚤的指数，都以夏季为转拆点，即有些蚤指数夏季最高，而另一些则夏季最低。此外，秋季指数均高于春季。
This paper reports the seasonal fluctuation of 15 species of fleas in northern China. The indices of these fleas were all turned in summer, with some fleas index highest in summer and the lowest in summer. In addition, the autumn index is higher than the spring.