I have not seen an "adapter" that goes from XLR to TRS 1/4, but there are cables that are made with Male/Female XLR on one side and TRS on the other. Hosa is one company I know of that makes these cables.
FYI: You can order custom made cables from RAPCO through your local RAPCO dealer.
[This message has been edited by Fishmed (edited 09-29-1999).]