  In a previous paper (nlin.CD/0107041) the following class of billiards was
studied: For $f: [0, +\infty) \longrightarrow (0, +\infty)$ convex,
sufficiently smooth, and vanishing at infinity, let the billiard table be
defined by $Q$, the planar domain delimited by the positive $x$-semiaxis, the
positive $y$-semiaxis, and the graph of $f$.
  For a large class of $f$ we proved that the billiard map was hyperbolic.
Furthermore we gave an example of a family of $f$ that makes this map ergodic.
Here we extend the latter result to a much wider class of functions.
