Mystery #3 (b) - Nightcrawler (Lumbricus terrestris) likely. - 3/30/12 - Sticks and Stones 4/17/13 - bugguide page before deletion
Charley Eiseman had a suggestion - Nightcrawlers.
No one else thinks this is bug related.
Since BugGuide only does bugs the page got frassed (deleted).
I wanted a copy before it's gone, so here it is.
Frass is the correct name for bug poop.