  For the generalized Jacobi, Laguerre and Hermite polynomials $P_n^{(\alpha_n,
\beta_n)} (x), L_n^{(\alpha_n)} (x),$\break $H_n^{(\gamma_n)} (x)$ the limit
distributions of the zeros are found, when the sequences $\alpha_n$ or
$\beta_n$ tend to infinity with a larger order than $n$. The derivation uses
special properties of the sequences in the corresponding recurrence formulae.
The results are used to give second order approximations for the largest and
smallest zero which improve (and generalize) the limit statements in a paper of
Moak, Saff and Varga [11].
