[mew-int 2801] Delete local copy

Sometimes, especially when I receive an email with a very large
attachment, after looking at the attachment I want to remove the local
copy of the message while retaining it on the IMAP server (and,
presumably, put the T mark on the message). In other words, I want the
reverse of mew-summary-retrieve-message. I think I want the inverse of
mew-summary-mark-retrieve-message as well, so I can mark a bunch of
messages and delete all their local copies in one swell foop. (Some
caution is needed, of course, in case the message is already deleted
from the server.) Is there some such function lurking where I haven't
noticed it?

- Harald