A review of the New Guinea species of Chimarra Stephens (Trichoptera: Philopotamidae) Author Cartwright, David text Memoirs of Museum Victoria 2020 2020-12-31 79 1 49 http://dx.doi.org/10.24199/j.mmv.2020.79.01 journal article 10.24199/j.mmv.2020.79.01 1447-2554 8065297 urn:lsid:zoobank.org:pub:28679CF3-B7AF-47D9-AE0B-DC16F6DA3C4F Chimarra bicornis sp. nov. Figures 91–93 Holotype . Male (figured specimen CT-364), PNG ( Morobe Province ), Wau , Big Wau Creek , 1300 m , about 7° 20' S , 146° 43' E , November 1965 , P. Shanahan ( BPBM ). Diagnosis. Chimarra bicornis is similar to C. ulmeri but different to all other New Guinea Chimarra species in having a pair of sclerotised, curved dorsal and ventral branches of the lateral lobes on segment X. In C. ulmeri , the apices of the dorsal or upper branch of the lateral lobes are directed dorsally ( Kimmins, 1962 : fig. 16A; Neboiss, 1986a : fig. p. 106) or posterodorsally (fig. 90), whereas in C. bicornis , they are directed dorso-laterally. (There is also a species from northern Australia with a similar pair of curved mesal processes on segment X – C. adaluma Cartwright [ Cartwright, 2002 ]). Description. General body colour and wings brownish. Wings similar to those of C. ukarumpana (fig. 7). Length of forewing: male 5.9 mm. Forewing with forks 1, 2, 3 and 5 present, Rs slightly sinuous or curved, slightly thickened, basad of discoidal cell. Male. Segment IX anterior margin in lateral view, with rounded extension anteroventrally (fig. 91), ventral process small, sub-triangular, situated basally on segment IX (figs 91, 92), in lateral view, length about 0.6 times width (fig. 91). Segment X lateral lobes sclerotised, short, slender, with dorsal and ventral branches, dorsal branch directed dorso-laterally, ventral branch directed ventro-posteriorly, with sensilla not discerned (figs 91, 93). Phallus with two slender spines included subapically (figs 92, 93). Inferior appendages short, robust, acute apices angled dorso-mesally (figs 91–93), in lateral view, angled at about 45° to horizontal, subquadrate, length about 2.5 times width, broadest in distal half, tapered slightly basally (fig. 91), in ventral view, appear sub-ovate, length about 2.8 times width (fig. 92). Female . Unknown. Etymology. Bicornis – Latin for two horned, two pronged (paired curved, dorsal branches of lateral lobes on segment X). Remarks. Chimarra bicornis is known only from the holotype male in north-east PNG .