Chimarra cavata sp. nov. Figures 57–59 Holotype. Male (dried, pinned specimen CT-355 figured), PNG, Central Province, Mamai Plantation, east of Port Glasgow, 150 m, about 10° 16' S, 149° 30' E, 27 January 1965, R. Straatman (BPBM). Paratypes. PNG, 2 males (CT-394, CT-393 damaged), collected with holotype (BPBM). Diagnosis. The males of C. cavata can be separated from all other New Guinea species by the combination of the inferior appendages with a prominent projection on the mid-ventral margin, which in lateral view, partly forms a concavity in the distal half, plus slender and incurved apices which are pincer-like in ventral view. Description. General body colour and wings fawn to light brownish. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 3.5–4.2 mm. Forewing with forks 1, 2, 3 and 5 present, Rs moderately to strongly sinuous or curved, thickened basad of discoidal cell. Male. Segment IX anterior margin in lateral view, with broad, angular extension ventrally (fig. 57), ventral process short, triangular, apically acute, situated basal to distal margin of segment IX (figs 57, 58), in lateral view length about 1.5–1.6 times width (fig. 57); preanal appendages rounded apically. Segment X in lateral view mesal lobe partly produced dorsally (fig. 57), narrowly bifid in dorsal view (fig. 59), lateral lobes appear laterally compressed with sensilla not discerned (figs 57, 59), in lateral view lateral lobes robust, hard to distinguish from phallus (fig. 57), in ventral and dorsal views appear very slender in distal half, apices acute (fig. 58). Phallus with two slender spines included near middle. Inferior appendages robust, broadest in basal half, narrowed strongly near midlength, acute apices directed posteromesally (figs 57–59), in lateral view angled at about 45° to horizontal, length about 3.3 times width, ventral margin with a prominent pointed projection on the mid-ventral margin that partly forms a concavity in distal half, dorsal margin mostly straight (fig. 57), in ventral view projection of ventral margin setose and irregular on its mesal margin, apices slender, nearly touching (fig. 58). Female. Unknown. Etymology. Cavata – Latin for hollow, hollowed out (inferior appendages). Remarks. Chimarra cavata is known only from the type locality in south-east PNG.

Published as part of Cartwright, David, 2020, A review of the New Guinea species of Chimarra Stephens (Trichoptera: Philopotamidae), pp. 1-49 in Memoirs of Museum Victoria 79 on pages 20-21, DOI: 10.24199/j.mmv.2020.79.01, http://zenodo.org/record/8065297