The Collaborative International Dictionary of English v.0.48:

Urocerata \U`ro*cer"a*ta\, n. pl. [NL., fr. Gr. ? tail + ?, ?,
   horn.] (Zool.)
   A division of boring Hymenoptera, including Tremex and allied
   genera. See Illust. of Horntail.
   [1913 Webster]