The Collaborative International Dictionary of English v.0.48:

Platyptera \Pla*typ"te*ra\, n. pl. [NL., fr. Gr. ? broad + ? a
   wing.] (Zool.)
   A division of Pseudoneuroptera including the species which
   have four broad, flat wings, as the termites, or white-ants,
   and the stone flies (Perla).
   [1913 Webster]