Porrostoma haemorrhoidale Waterhouse. Larvae 1878

Diagnosis. Porrostoma is defined within Metriorrhynchinae by the short robust processes in middle of the posterior margin of the tergites T1–T3 (figure 115), the shape of the meso-and metasternum and the longitudinally divided thoracic and abdominal terga. Porrostoma haemorrhoidale is much more slender than P. rhipidium (figures 115–119, 109–112), and has longitudinally divided tergum A9 (figure 118).

Description of mature larva. Body dark brown, tergites T1 and posterolateral parts of tergites A7–A9 brownish-yellow (figure 118), sternites T2–T3 and A1–A8 light brown, posteroventral part of segment A9 brownish-yellow. Epicranium without membranous lateral part (figure 104). Mandibles slender (figure 113). Most of dorsal part of palpifer membranous, only narrow apical sclerotized ring present. Mala vestigial, with one long seta at apex, freely attached to inner dorsal margin of palpifer. Maxillary palpi 1.5 times length of palpifer, basal palpomeres transverse, apical palpomere long, slender. Ventral plate rounded laterally (figure 104). Terga T1–T3 and A1–A9 divided by longitudinal membranous line in two tergites (figures 115, 118). Pronotum with two short, robust processes at posterior margin, following segments in addition also with small tubercle with seta in posterior angle, this tubercle gradually prolonged, finger-like in abdominal segments A4–A8. Prosternum triangular, well sclerotized, meso-and metasternum almost membranous. Spiracular plate T2 followed by membranous tubercle. Spiracle located between posterior margin of plate and apex of tubercle. Posterior pleurites T2 and T3 inconspicuous. Abdominal spiracular plates A1–A8 with long, membranous tubercle, posterior tubercle small sclerite. Segment A9 emarginate at apex (figure 119).

Measurements. BL 12.2 mm, PW 1.75 mm PL 1.15 mm.

Pupa. Exarate, slender, pronotum with six short, triangular tubercles at frontal and posterior angles and in middle part of lateral margin, each tubercle bearing one long seta. Terga A1–A8 with long tubercles in posterior angles and two much smaller, slender tubercles at posterior margin, each segment with long tubercle in pleural part, each tubercle with subapically situated long seta.

Material examined. Australia, Lake St. Clair, TAS, 750 m, 25–27.i.1980, J. Lawrence and T. Weir, 25 larvae of various stages, one pupa and four adults (CSIRO); note: under bark and in rotten logs.