Horntail or wood wasp is the common name for any of the 60 member of the family Siricidae, of the order Hymenoptera, closely related to the sawfly. They are non-social wasps, brown, blue and black with yellow parts in colour, and often reach up to 3.75cm long. Suborders Apocrita Symphyta Many families, see article Hymenoptera is one of the larger orders of Insects, comprising the sawflies, wasps, bees, and ants. ... Families (Cephoidea)   Cephidae-stem sawflies (Megalodontoidea)   Megalodontidae   Pamphilidae-leaf-rolling      & web-spinning sawflies (Orussoidea)   Orussidae-parasitic wood wasps (Siricoidea)   Siricidae- horntails (Tenthredinoidea)   Argidae-argid sawflies   Blasticotomidae   Cimbicidae-cimbicid sawflies   Diprionidae-conifer sawflies   Pergidae-pergid sawflies   Tenthredinidae-common sawflies (Xyeloidea)   Anaxyelidae-cedar sawflies   Xyelidae-xyelid sawflies   Xiphydriidae-wood wasps Symphyta is... WASP (an acronym for White Anglo-Saxon Protestant) is a term that denotes the culture, customs, and heritage of the American élite Establishment. ...

Female horntails leave their eggs in tree bark, the larvae are wood borers, and live in the tree for up to 2 years.

The pigeon horntail (Tremex columba) can grow up to 6cm long.