The Collaborative International Dictionary of English v.0.48:

Dipodomys \Dipodomys\ n.
   a genus of rodents of the family Heteromyidae, comprising
   the genus of kangaroo rats which live in arid regions of
   Mexico and the western U. S.

   Note: An Australian rodent of the genus Notomys is also
         referred to as a kangaroo rat, as is the potoroo. See
         kangaroo rat

   Syn: genus Dipodomys.
        [WordNet 1.5 +PJC]

WordNet (r) 3.0 (2006):

Dipodomys
    n 1: kangaroo rats [syn: Dipodomys, genus Dipodomys]