The Collaborative International Dictionary of English v.0.48:

Sauba ant \Sau"ba ant`\ (Zool.)
   A South American ant (Oecodoma cephalotes) remarkable for
   having two large kinds of workers besides the ordinary ones,
   and for the immense size of its formicaries. The sauba ant
   cuts off leaves of plants and carries them into its
   subterranean nests, and thus often does great damage by
   defoliating trees and cultivated plants.
   [1913 Webster]