notum--prophetes.ai

‖ notum
  (ˈnəʊtəm)
  [mod.L., ad. Gr. νῶτον back.]
  The dorsal part of the thorax in insects.

1877 Huxley Anat. Inv. Anim. vii. 404 A distinct median sclerite, the sternum, may be observed; and a much larger tergal piece, the notum.

Oxford English Dictionary