pronotum

from The Collaborative International Dictionary of English v.0.48

Pronotum \Pro*no"tum\, n.; pl. {Pronota}. [NL. See {Pro-}, and
   {Notum}.] (Zool.)
   The dorsal plate of the prothorax in insects. See Illust. of
   {Coleoptera}.
   [1913 Webster]