Prophragmata

from The Collaborative International Dictionary of English v.0.48

Prophragma \Pro*phrag"ma\, n.; pl. {Prophragmata}. [NL., fr. Gr.
   ? before + ?, ?, fence, screen. ] (Zool.)
   An internal dorsal chitinous process between the first two
   divisions of the thorax of insects.
   [1913 Webster]