General :: Using Find With File Name And Mtime To Remove Files Gets Arg List Too Long Error?

I need to delete all *.trc files that are older than 30 days and I am getting a "Argument list too long" error. There are other files that should not be deleted which is why I am using the "*.trc" and newer files need to be kept as well. I have seen other postings but they do not cover both of the conditions. Below are 2 of the many attempts at doing this but I cannot get this to work.

find *.trc -mtime +31 -print| xargs rm -f {}
find *.trc -mtime +31 -print -exec rm -f {} ;