Wheel Bug nymph.
Emesopsis infenestra Tatarnic, Wall & Cassis, 2011 (GENUS AND SPECIES NEW TO N.Z.!)
One adult in swards of long grass in wasteland area.
Tatarnic, N.J.; Wall, M.A.; Cassis, G. 2011: A systematic revision of the Australian ploiarioline thread-legged assassin bugs (Hemiptera: Reduviidae: Emesinae). Zootaxa, 2762: 1-30. [see p. 12, and Figs. 6, 8 A-C, 9]
Reduviidae (from the contained genus, Reduvius which comes from the Latin reduvia meaning hangnail or remnant) is a large, cosmopolitan family of predatory insects in the suborder Heteroptera. It includes assassin bugs (genera include Melanolestes, Platymeris, Psellipus, Rasahus, Reduvius, Rhiginia, Sinea, Triatoma, and Zelus), wheel bugs (Arilus cristatus), and thread-legged bugs (the subfamily Emesinae, including the genus Emesaya). There are about 7000 species altogether, making it one of the largest families in the Hemiptera.