Mr. Bones

Mr. Bones, also referred to generically as "Skeletons," are skeletal ghosts appearing only in the game Luigi's Mansion that are similar to Dry Bones. They are first encountered in the Boneyard where they were disturbed by Spooky's barking. They attack by throwing bones at Luigi. Mr. Bones are also found in the Graveyard and have to be defeated to lure out Bogmire. More Mr. Bones are encountered in the Telephone Room. These ghosts have thirty HP. Mr. Bones can also, like all other normal ghosts, be defeated by one of the three Elements.

Reference
Sig. Tuttossi