Head (Fig. 22) transverse, widest posteriorly, slightly emarginate on posterior dorsum. Occipital foramen widest behind mid-length. Mandible short, stout, not constricted before rounded apex. Labrum sub-circular, wider than long, densely setose anteriorly. Maxillary palpi with process on palpifer and smaller one on 1st joint. Last joints of maxillary and labial palps sub-equal. Maxillary palp longer than femur plus tibia. No setae on maxillary sclerite, many on labial palpifer and mentum. Epistoma not emarginate. One ocellus. Genae distinctly shouldered, genal setae sparse and slender. Hypostoma with two or three setae. Thorax. Pronotum nearly twice as wide as long. Anterior half setose, posterior half striate, notal spots light castaneous. Mesonotum with transverse line. Presternum setose, fused with epipleurum anteriorly. Eusternum (Fig. 23) with two smooth glabrous plates each with a rugose pigmented spot anteriorly. Legs well-developed, 4-jointed. Abdomen. Pleural discs not evident. Ampullae alutaceous, moderately protuberant Spiracles oval. Three anal lobes. Hind-intestine without sclerotized thickening of intima. Pupa. Pronotum beset with pigmented spines and setae, most dense along the anterior margin, sparser along the lateral margins; a transverse line of spines anterior to mid-length; posterior half of disc glabrous. Meso- and meta-thorax glabrous except for sparse short setae. First abdominal segment with single spine at mid-length on the lateral margin. Segments 2–6 beset with backwardly directed spines and setae forming an almost continuous line along the posterior margin, sparsely setose anteriorly enclosing a transverse oval glabrous area in the middle of the segment. Pleural margins with three or four long setae. Seventh segment with a transverse row of three or four spines anteriorly, two larger hooked lateral spines inwardly directed behind mid-length, four or five large forwardly directed spines in a transverse line posteriorly, Eighth segment with two large hooked spines posteriorly, directed forward and inward. Larvae, pupae and adults were taken from dead branches of Quercus at Hastings in January. The species has also been taken from Rimu flooring at Nelson. Genus Navomorpha Blanchard Navomorpha lineatum (Fabricius) (Figs. 24 and 25). Egg. Length, 2.2 mm; width, 0.9 mm; elongate-ovoid, white Chorion with close set papillae or aciculae. Mature Larva. Cylindrical, elongate, length up to 38 mm. Colour white. Body setae fairly stout and castaneous. Head (Fig. 24) sub-quadrate, slightly emarginate on posterior margin of dorsum. Anterior foramen twice as wide as long. Posterior foramen widest at mid-length or anteriorly. Mandible normal. Clypeus trapezoidal, unpigmented. Labrum transverse, oval. Epipharynx similar to Oemona hirta. Maxillary palp and femur plus tibia sub-equal in length. Second and third joints sub-equal. Maxillary sclerite with one or two setae. Palpifer and first joint of palp with processes. Epistoma with two setae. Front with setae as in Oemona. Epistoma shallowly emarginate in front. Antennae prominent, 1st and 2nd joints subequal, 3rd about half as long. Three ocelli. Genae shouldered, genal setae sparse and fine. Hypostoma with two or three setae on each side. Thorax. Pronotum about one and a-half times as wide as long. Notal spot and median line present, anterior half setose, posterior third striate, post-notal fold present. Metanotum with X-shaped line. Presternum fused with epipleurum, setose. Eusternum not defined anteriorly where it bears a few setae, posteriorly divided into two smoother plates. Legs 4-jointed, well developed. Prothoracic spiracle (Fig. 25) with pecten on posterior margin. Abdomen with epipleurum protuberant on the last three segments. Pleural tubercles present, discs not evident. Ampullae coarsely tuberculate, moderately projecting. Spiracles oval. Hind intestine without sclerotized thickening of intima. Pupa. Mandible with four or five setae at mid-length on outer margin. Clypeus with one or two on each side near base of mandible. A group of setae on each side of front in a half circle round the base of the antenna and two smaller para-median groups between these. Gena with 3 or 4 setae. Outwardly directed conical process on distal end of basal joint of antenna. Short pigmented asperities on dorsa of abdominal segments. About six well-developed, recurved, pigmented spines on posterior margin of 7th dorsum. Apex of hypopygium with small pigmented spines. Larvae were taken from living branches of Douglas Fir (Pseudotsuga taxifolia) at Rotorua in January, and adults emerged in November. Adults have been taken in the field in the same locality in December and January. In the laboratory the eggs were deposited in crevices in the wood. It is not thought that the insect can attack healthy trees, and there is evidence that conditions suitable for oviposition are furnished by the oviposition scars of the cicada Melampsalta cingulata (Fabr.) which