The Collaborative International Dictionary of English v.0.48:

Manteidae \Manteidae\ prop. n.
   A natural family of insects including the mantises. Also
   spelled Mantidae.

   Syn: Mantidae, family Mantidae, family Manteidae.
        [WordNet 1.5]

The Collaborative International Dictionary of English v.0.48:

Mantidae \Mantidae\ prop. n.
   The natural family conmprising the mantises. Same as
   Manteidae.

   Syn: family Mantidae, Manteidae, family Manteidae.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

Mantidae
    n 1: mantises [syn: Mantidae, family Mantidae, Manteidae,
         family Manteidae]