Abstract
This communication being a part of the ecological investigation on the soil meso and microfauna of uncultivated plots of West Bengal, India, brings to light the following information : (1) Cryptostigmata mites predominate during the monsoon months (July-August) over other groups of mites such as Mesostigmata, Prostigmata and Astigraata as well as Collembola; in the scale of population-abundance next comes Collembola closely followed by Mesostigmata mites; population of both Prostigmata and Astigmata mites are significantly low as to both quantitative and qualitative composition; and (2) population size of both Acari and Collembola appear to be dependent on organic matter-microbes complex operating in soil.

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