I’m guessing forest bugs don’t see a whole lot of black widow action.

At least my anecdotal experience, black widows seem to prefer hidden spaces in otherwise open areas like anywhere near a home, a pile of rocks in the middle of a field, and places like that.

Not that forest bugs can’t leave the forest and black widows can’t thrive in forested areas, just that these two things seem to be mostly mutually exclusive in modern life.