**Manisha Kumari***

Department of Zoology, B.N.Mandal University, Madhepura, Bihar, India.

Received : 2^{nd} June, 2018 ; Revised :30^{th} August,2018

**Abstract**: In the natural distribution of species population, there exist a paradoxial relationship between richness and abundance. The paradox has been investigated in terms of inverse relationship between the species richness & abundance in the population of Bihar hairy caterpillar, *Spilosoma* spp. surveyed & sampled from urban area of Saharsa district, Bihar. This peculiarity amounts to the logarithmic relationship in the statistical computation of species diversity as per Shannon Wiener equation^{1}.

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