The Collaborative International Dictionary of English v.0.48:

Phyllophagan \Phyl*loph"a*gan\, n. [Phyllo- + Gr. fagei^n to
   eat.] (Zool.)
   (a) One of a group of marsupials including the phalangists.
   (b) One of a tribe of beetles which feed upon the leaves of
       plants, as the chafers.
       [1913 Webster]