[Evolution] How can I correct Evolution's list of available printers?

[George Reeke <reeke mail rockefeller edu>]

Dear colleagues,
   Can someone tell me where Evolution (on Linux and gnome) gets the
list of printers it displays when you click the Print button--or more
precisely, how to correct that information when it is incomplete?
   I have two RHEL 4 systems (stuck on Evo 2.0.2 I'm afraid, but
hopefully this detail has not changed), both using cups printing
(working in other applications).  One Evo displays the available
cups printers, the other does not--just the default "Generic
Postscript" and "Create a PDF Document" printers. 
   The only differences I can think of that might be relevant are that
the system that works is 32-bit and the user does not run Nautilus,
whereas the system that does not work is 64-bit SMP and the user does
run Nautilus.  The /etc/cups/cupsd.conf files have the same default
Browse settings.  Both have similar model HP LaserJets and other
dissimilar printers.
   Sorry if this is a FAQ--I couldn't find the answer in the docs or
by googling or by comparing files in /usr/share/libgnomeprint and
users' .gnome, .gnome2, and .evolution.
   Thanks,
George Reeke, Ph.D.
Laboratory of Biological Modelling
The Rockefeller University
1230 York Avenue
New York, NY  10065
email:  reeke rockefeller edu