  We propose a notion of Misiurewicz condition for transcendental entire
functions and study perturbations of Speiser functions satisfying this
condition in their parameter spaces (in the sense of Eremenko and Lyubich). We
show that every Misiurewicz entire function can be approximated by hyperbolic
maps in the same parameter space. Moreover, Misiurewicz functions are Lebesgue
density points of hyperbolic maps if their Julia sets have zero Lebesgue
measure. We also prove that the set of Misiurewicz Speiser functions has
Lebesgue measure zero in the parameter space.
