The Collaborative International Dictionary of English v.0.48:

mantispid \man*tis"pid\, n. (Zool.)
   Any neuropterous insect of the genus Mantispa, and allied
   genera. The larvae feed on plant lice. Also used adjectively.
   See Illust. under Neuroptera.
   [1913 Webster]

WordNet (r) 3.0 (2006):

mantispid
    n 1: insect that resembles a mantis; larvae are parasites in the
         nests of spiders and wasps