ssl/ssh equivalent to X -query <hostname> :<display numbre>?

If I ssh into a box with the -X option I can then pipe my X display back to the X server running on my local workstation. The network traffic is completely encrypted under such conditions. This is fine if I only want to pop up an XEmacs window from the remote box. If I want the same thing I get with X -query <hostname>:<display number> things get a bit more difficult. Is there an easy way to run XDMCP using ssh or a similar encryption? TIA, Steve