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The convolution sum
$\sum{_{m<n/16}\,\sigma (m)\sigma (n\,}-16m)$
is evaluated for all 
$n\,\in \,\mathbb{N}$. This evaluation is used to determine the number of representations of 
$n$ by the quadratic form
$x_{1}^{2}\,+\,x_{2}^{2}\,+\,x_{3}^{2}\,+\,x_{4}^{2}\,+\,4x_{5}^{2}\,+\,4x_{6}^{2}\,+\,4x_{7}^{2}\,+\,4x_{8}^{2}$.
