  We present a two-species laser cooling apparatus capable of simultaneously
collecting Rb and Hg atomic gases into a magneto-optical trap (MOT). The atomic
sources, laser system, and vacuum set-up are described. While there is a loss
of Rb atoms in the MOT due to photoionization by the Hg cooling laser, we show
that it does not prevent simultaneous trapping of Rb and Hg. We also
demonstrate interspecies collision-induced losses in the
${}^{87}$Rb-${}^{202}$Hg system.
