The Collaborative International Dictionary of English v.0.48:

Nematocera \Nem`a*toc"e*ra\, n. pl. [NL., fr. Gr. nh^ma,
   nh`matos, a thread + ke`ras horn.] (Zool.)
   A suborder of dipterous insects, having long antennae, as the
   mosquito, gnat, and crane fly; -- called also Nemocera.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Nematocera
    n 1: mosquitoes; fungus gnats; crane flies; gnats; sand flies
         [syn: Nematocera, suborder Nematocera]