The Collaborative International Dictionary of English v.0.48:

Necrophagan \Ne*croph"a*gan\, a. [See Necrophagous.] (Zool.)
   Eating carrion. -- n. (Zool.) Any species of a tribe
   (Necrophaga) of beetles which, in the larval state, feed on
   carrion; a burying beetle.
   [1913 Webster]