Linux – find all directories having less than x files inside

I'm not sure how -path will handle the "do not descend into directories that don't match *bar" requirement, and I'm too lazy to build an environment to find out.
I do know the following will work on pretty much any *nix platform:

for dir in `ls -1 | grep bar`; do
   find $dir -type f -name foo
done

Additional weaseling of the ls/grep bit may be required if you have plain files, sockets, etc. in your top-level directory, or if you want to revise your conditions a little.

You can use the -path and -prune command line parameters to do this

find /path/on/server -mtime -1 -o -path '*.svn' -prune -o -path '*statistics' \ 
-prune -o -exec ls -l {} \;

This has the advantage of not searching the directories that you want excluding.

Also note that your ls -l may not be doing what you expect as it will list the entire contents of directories that are passed to it so you will get some files listed multiple times.

From the comments ls -ld would be better.