getting dozens of identical "trackback" directory 404 errors

I don't know if this is a Montezuma-specific thing, but I couldn't find anything about it on google nor the forum here. Starting a few months ago, using a 404 alert plugin, I get dozens and dozens of 404 errors for a nonexistent and non-linked directory "trackback" in my home directory, usually in spurts where five or ten will come through in the course of a couple minutes. I'm perplexed why this is happening, and wonder if it is something to do with the mysterious workings of the theme?

Many apologies if this is off-topic here. Just thought it would be a good place to start.

Thanks-
tony