The Collaborative International Dictionary of English v.0.48:

Bubalus \Bubalus\ n.
   a genus of ruminants which in some classification systems is
   included in the genus Bos; the water buffaloes.

   Syn: genus Bubalus, tribe Bubalus.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Bubalus
    n 1: in some classification systems included in genus Bos; water
         buffaloes [syn: Bubalus, genus Bubalus, tribe
         Bubalus]