T.E.R:R.A.I.N - Taranaki Educational Resource: Research, Analysis and Information Network

Wasp (Black and white Ichneumonid)

Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (parasitic Apocrita)
Superfamily: Ichneumonoidea (Braconids and Ichneumons)
Family: Ichneumonidae (Ichneumon Wasps)
Subfamily:  Cryptinae
Tribe: Cryptini includes 25 genera. Acroricnus, Agonocryptus, Agrothereutes, Apsilops, Aritranis. Baryceros, Buathra, Compsocryptus, Cryptanura, Cryptus, Diapetimorpha, Gambrus, Helcostizus, Hoplocryptus, Idiolispa, Ischnus, Lanugo, Listrognathus, Lymeon, Mesostenus, Messatoporus, Pachysomoides, Polycyrtus, Sphecophaga, Trychosis
Species: The genus Lymeo has 3 species and subspecies  L. cinctiventris · L. orbum · L. orbus

There is world wide over 80,000 species of Ichneumonid wasps.  
New Zealand has over 300 species with only about 80 named.   Many are native but several have been introduced.
Ichneumon wasp species are highly diverse, ranging from 3 millimetres (0.12 in) to 130 mm (5.1 in) long. Most are slender, with the females of many species (particularly in the genus Megarhyssa) having an extremely long ovipositor for laying eggs. The female finds a host and lays an egg on, near, or inside the host's body. Upon hatching, the larval ichneumon feeds either externally or internally, killing the host when they themselves are ready to pupate. Despite looking formidable, the ovipositor does not deliver a sting like many wasps or bees. It can be used by the wasps to bore into and lay eggs inside rotten wood.

This black and white wasp (body 18mm) was found in New Plymouth mid January. 

Head of the black and white wasp