Back with another question.

OK I have checked, rechecked, and triple checked that my figure has ALL the polygons grouped, and that those groups match exactly the names of the bones they attach to.  I deleted all the bones I didn't need, (tried leaving all the bones from the base figure...didn't work either) except for that pesky genital? bone.  Which leads me to my first question.  Just what friggin bone is this?  I cant select it, move it or delete it, and when I leave the setup room it becomes part of my figure.

When leaving the setup room, I still get the message that some of my polygons are not grouped, however as stated I have checked this, I even used the "show non-grouped faces" in the grouping tool and it finds nothing.

The figure has lshoulder, rshoulder, chest, abdomen, and hip, which match exactly to the bone structure.  I've read every tutorial I can find and watched videos on you tube till I'm crosseyed, and I'm only slightly less confused than before.  Thanks for any help.