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.