postscutellum

from The Collaborative International Dictionary of English v.0.48

Postscutellum \Post`scu*tel"lum\, n. [NL. See {Post-}, and
   {Scutellum}.] (Zool.)
   The hindermost dorsal piece of a thoracic somite of an
   insect; the plate behind the scutellum.
   [1913 Webster]