  In this paper we prove the equidistribution of $\Cbf$-special subvarieties in
certain Kuga varieties, which implies a special case of the general
Andr\'e-Oort conjecture formulated for mixed Shimura varieties proposed by
R.Pink. The main idea is to reduce the equidistribution to a theorem of
Szpiro-Ullmo-Zhang on small points of abelian varieties and a theorem on the
equiditribution of $C$-special subvarieties of Kuga varieties of rigid type
treated by the author in a previous paper.
