Ugly background but I really didn't want to disturb this little spider. Looks like he has a bulls skull on his rear end.

Corrected by Bugguide.net that this is not a spider.

Identification
Easily separated from spiders by the broad fusion of the two body segments, so that the body appears to be composed of a singular segment. Also, as they do not possess silk glands, harvestmen can't form webs. Uniquely among the arachnids they possess a penis, and copulate with direct fertilization.