  In a previous paper [3] we computed cohomology groups H^5 (Gamma_0 (N), \C),
where Gamma_0 (N) is a certain congruence subgroup of SL (4, \Z), for a range
of levels N. In this note we update this earlier work by extending the range of
levels and describe cuspidal cohomology classes and additional boundary
phenomena found since the publication of [3]. The cuspidal cohomology classes
in this paper are the first cuspforms for GL(4) concretely constructed in terms
of Betti cohomology.
